CARBON MONOXIDE (CO)

Sources: Unvented kerosene and gas space heaters; leaking chimneys and furnaces; back-drafting from furnaces, gas water heaters, woodstoves, and fireplaces; gas stoves. Automobile exhaust from attached garages. Environmental Tobacco Smoke.

Health Effects: At low concentrations, fatigue in healthy people and chest pain in people with heart disease. At higher concentrations, impaired vision and coordination; headaches; dizziness; confusion; nausea. Can cause flu-like symptoms that clear up after leaving home. Fatal at very high concentrations.

Levels in Homes: Average levels in homes without gas stoves vary from 0.5 to 5 parts per million (ppm). Levels near properly adjusted gas stoves are often 5 to 15 ppm and those near poorly adjusted stoves may be 30 ppm or higher.

Steps to Reduce Exposure:

• Keep gas appliances properly adjusted.
• Consider purchasing a vented space heater when replacing an unvented one.
• Use proper fuel in kerosene space heaters.
• Install and use an exhaust fan vented to outdoors over gas stoves.
• Open flues when fireplaces are in use.
• Choose properly sized woodstoves that are certified to meet EPA emission standards. Make certain that doors on all woodstoves fit tightly.
• Have a trained professional inspect, clean, and tune-up central heating system (furnaces, flues, and chimneys) annually. Repair any leaks promptly.
• Do not idle the car inside garage.

Can I Move The Thermostat On My Heat Pump Up And Down Like Other Heating Systems?

During the heating season, we recommend a setting that is comfortable for your household. Once your thermostat is set, the best policy is to leave it alone. Raising the thermostat as little as 2 ° F may cause the supplementary heat to come on, thereby increasing your energy usage. Although night setback is recommended during the winter for most types of heating systems, to save energy and reduce costs, it is not generally recommended for a heat pump unless a programmable thermostat designed expressly for a heat pump is used. When you have a heat pump, and raise the house temperature in the morning, the supplementary heat may come on using more electricity than you save during the night. Reduce the thermostat temperature setting for weekend trips or vacations during the heating season.

Why Does My Outdoor Unit Sometimes Have Ice Buildup During The Winter?

Under certain weather conditions, the outdoor unit will develop ice buildup. When the unit defrosts this ice, it gives off water vapor, which appears to be smoke. If excess ice builds up on the outdoor unit after more than 90 minutes elapsed time, switch emergency heat to "on" and call your heating and cooling contractor if the condition does not clear.

Why Should I Invest In A 13 SEER Or Higher Unit?

     There are 13 reasons why you should purchase a heat pump/air conditioner carrying a 13 SEER rating or higher:

1. 13 SEER or higher units are 20% to 50% more efficient than 10 SEER units, saving you energy dollars through every season of the year.
2. They are much quieter than 10 SEER units, which makes your home a more pleasant place to live.
3. They have a 5 to 10 year compressor warranty and up to five years full parts, labor, materials and freon warranty, which ensures that the costs to run this unit are low. (Ask your contractor for details)
4. They are built better and have a much nicer fit and finish.
5. 13 SEER or higher units are fitted with much better controls and protective devices to protect the unit if a problem occurs (bad power, refrigerant loss, etc.)
6. 13 SEER or higher units have a new high tech scroll compressor which is extremely reliable and provides warmer feeling heat.
7. They have a 5 minute time-delay to keep heat from turning on and off during storms, or if someone is tampering with the thermostat.
8. They have commercial grade service valves to keep service costs down and equipment life high.
9. They have compressor sound and fan insulation systems that are attractive and significantly reduce the sound of the outdoor unit.
10. They have a much better blower than the standard system which enhances performance and comfort.
11. They have an expansion valve that adjusts the refrigerant flow which allows the unit to provide a higher level of comfort and better humidity control.
12. 13 SEER or higher units have an accumulator which catches extra refrigerant and helps protect the compressor.
13. And lastly, the Department of Energy says so!!  Oh yeah!  In January 2006, the DOE is raised the minimum cooling efficiency on residential air conditioners and heat pumps to 13 SEER from its older minimum of 10 SEER.   Questions? 

Is The Heat Pump An Economical Or Expensive Way Of Heating And Cooling, And How Does It Operate?

A heat pump may actually provide more than three units of heat for each unit of electricity used. If a kilowatt-hour of heat is needed for comfort, it can be supplied by a one thousand-watt electric heater. To provide the same amount of heat the heat pump might use as little as 330 watts in an hour. This is a ratio of three to one. The ratio is referred to as the Coefficient of Performance (COP). Electric resistance heaters have a COP of 1 because they are using electricity to create heat. A heat pump moves heat from the outside to the inside of the home and vice versa, not using energy to create heat. We recommend. a COP of at least 1.8 at standard test conditions of 17 ° F dry bulb and 15 ° F wet bulb.

I am sure that explanation was as clear as mud. Let's look at it this way. Gas and fuel oil prices are going through the roof. It looks like the heat pump is becoming a better option.

Should The Outdoor Unit Run Continuously?

Below the balance point, around 30 ° F it is normal for the outdoor fan to continually run. If the outdoor unit continually runs during normal heating (30 °-50 ° F outside), possible problems are:

• Thermostat set too high
• Thermostat needs adjustment
• Low refrigerant level in unit
• Thermostat exposed to cold draft
• Outside unit coil is blocked by snow, ice, etc.

If the outdoor unit continually runs during normal cooling, possible problems are:

• Low refrigerant level in unit
• Very warm weather (over 90 ° F)
• Thermostat located near heat source, such as appliances, TV, etc.
• Dirty filters or too many registers closed limiting air movement
• Improperly designed duct work
• Unit may be undersized

Why Should I Care about Energy Efficiency?

The total cost of any appliance (including an HVAC system) has three components - the purchase price, the cost of repairs and maintenance, and the cost to operate the appliance. The more energy efficient an appliance is, the less it costs to run and the lower your utility bills. Using less energy is good for the environment too; it can reduce air pollution and conserves our natural resources.

Why Does The Air At The Supply Grill Feel Cooler In The Heating Mode Than Other Types Of Heating Systems?

The accelerated movement of the supply air varies from 85 ° to 106 ° F in the winter. Air movement causes some evaporation of skin moisture causing the sensation of coolness. By setting the proper supply air speed on a heat pump it will provide comfortable air temperatures.

Infinity® Series Packaged Gas Furnace and Air Conditioner System Advanced Comfort Control With Electric A/C and Gas Heat

Models: 48XL

The Infinity air conditioner and gas furnace system represents forward-looking technology. It quietly cools and heats your home, automatically keeping temperatures and humidity levels in check.

• Up to 15 SEERproducts
• Up to 12 EER
• Up to 81% AFUE
• ENERGY STAR® approved
• Puron® refrigerant
• 40,000-130,000 heating capacity
• 2-5 ton cooling
• 72 dB(quiet as a vacuum)
• 2-stagescroll compressor
• Stainless steel heat exchanger
• High pressure and loss of charge switches
• Corrosion resistant inducer assembly with stainless steel shaft
• Uses Infinity control for precise comfort settings
• Louvered grille
• Infinity diagnostics
• Ideal Humidity System® for enhanced air quality, better dehumidification
• Uses Thermidistat™ control
• 10-year parts limited warranty when properly registered; Lifetime parts limited warranty on stainless steel heat exchanger when properly registered; 5-year parts limited warranty on copper coil; 10-year parts limited warranty on optional tin plated coil

ENERGY STAR®

As an ENERGY STAR partner, Carrier Corporation has determined that model 48XT Infinity® 15 packaged heat pumps that achieve system combinations of 14.5 SEER, 8.2 HSPF and 12.0 EER or higher meet the ENERGY STAR guidelines for energy efficiency. Proper sizing and installation of equipment is critical to achieve optimal performance.

To the original owner, the Carrier Infinity® Series Packaged HYBRID HEAT® Dual Fuel System is covered by a 10-year parts limited warranty upon timely registration of your new equipment. Stainless steel heat exchangers carry a lifetime parts limited warranty upon timely registration. Copper indoor evaporator coil is covered by a 5-year parts limited warranty. Optional tin plated evaporator coil is covered by a 10-year parts limited warranty. Ask your Carrier dealer about optional extended warranties, which may include labor. Warranty period is 5-year parts limited warranty and 20-year parts limited warranty on stainless steel heat exchanger if not registered within 90 days. Jurisdictions where warranty benefits cannot be conditioned on registration will automatically receive a 10-year parts limited warranty and a lifetime parts limited warranty on the stainless steel heat exchanger. See warranty certificate at carrier.com for complete details.

Infinity® Series Packaged Gas Furnace and Air Conditioner System Advanced Comfort Control With Electric A/C and Gas Heat

Models: 48XL

The Infinity air conditioner and gas furnace system represents forward-looking technology. It quietly cools and heats your home, automatically keeping temperatures and humidity levels in check.

• Up to 15 SEERproducts
• Up to 12 EER
• Up to 81% AFUE
• ENERGY STAR® approved
• Puron® refrigerant
• 40,000-130,000 heating capacity
• 2-5 ton cooling
• 72 dB(quiet as a vacuum)
• 2-stagescroll compressor
• Stainless steel heat exchanger
• High pressure and loss of charge switches
• Corrosion resistant inducer assembly with stainless steel shaft
• Uses Infinity control for precise comfort settings
• Louvered grille
• Infinity diagnostics
• Ideal Humidity System® for enhanced air quality, better dehumidification
• Uses Thermidistat™ control
• 10-year parts limited warranty when properly registered; Lifetime parts limited warranty on stainless steel heat exchanger when properly registered; 5-year parts limited warranty on copper coil; 10-year parts limited warranty on optional tin plated coil

ENERGY STAR®

As an ENERGY STAR partner, Carrier Corporation has determined that model 48XT Infinity® 15 packaged heat pumps that achieve system combinations of 14.5 SEER, 8.2 HSPF and 12.0 EER or higher meet the ENERGY STAR guidelines for energy efficiency. Proper sizing and installation of equipment is critical to achieve optimal performance. To the original owner, the Carrier Infinity® Series Packaged HYBRID HEAT® Dual Fuel System is covered by a 10-year parts limited warranty upon timely registration of your new equipment. Stainless steel heat exchangers carry a lifetime parts limited warranty upon timely registration. Copper indoor evaporator coil is covered by a 5-year parts limited warranty. Optional tin plated evaporator coil is covered by a 10-year parts limited warranty. Ask your Carrier dealer about optional extended warranties, which may include labor. Warranty period is 5-year parts limited warranty and 20-year parts limited warranty on stainless steel heat exchanger if not registered within 90 days. Jurisdictions where warranty benefits cannot be conditioned on registration will automatically receive a 10-year parts limited warranty and a lifetime parts limited warranty on the stainless steel heat exchanger. See warranty certificate at carrier.com for complete details.

Performance Series Packaged Gas Heat/Electric Cool System Efficient and Quiet Home Cooling With Gas Heat

Models: 48VL, 48XP

The packaged Performance air conditioner and gas furnace system keep your family cool in summer and toasty in the winter. With high SEER, EER and AFUE ratings, Carrier can save you money all year, compared with older, less efficient systems.

• 13 SEER / 11 EER (48XP)
• Up to 81% AFUE
• Puron® refrigerant
• As low as 72 dB (quiet as a vacuum)
• Scroll compressor
• High pressure and loss of charge switches
• Built-in Thermostatic Expansion Valve
• Louvered grille (48XP)
• Wired grille (48VL)
• Corrosion resistant inducer assembly with stainless steel shaft
• 10-year parts limited warranty when properly registered; 15-year parts limited warranty on aluminized heat exchangers; Lifetime parts limited warranty on stainless steel heat exchanger when properly registered; 5-year parts limited warranty on copper coil; 10-year parts limited warranty on optional tin plated coil

To the original owner, the Carrier Performance™ Series Packaged Gas Heat/Electric Cool System is covered by a 10-year parts limited warranty upon timely registration of your new equipment. Aluminized heat exchangers carry a 15-year parts limited warranty. Stainless steel heat exchangers carry a lifetime parts limited warranty upon timely registration. Copper indoor evaporator coil is covered by a 5-year parts limited warranty. Optional tin plated evaporator coil is covered by a 10-year parts limited warranty. Ask your Carrier dealer about optional extended warranties, which may include labor. Warranty period is 5-year parts limited warranty, 15-year parts limited warranty on aluminized heat exchanger and 20-year parts limited warranty on stainless steel heat exchanger if not registered within 90 days. Jurisdictions where warranty benefits cannot be conditioned on registration will automatically receive a 10-year parts limited warranty, a 15-year parts limited warranty on the aluminum heat exchanger and a lifetime parts limited warranty on the stainless steel heat exchanger. See warranty certificate at carrier.com for complete details.

Performance™ Series Packaged HYBRID HEAT® Dual Fuel System Efficient Gas Warmth Paired With Money-Saving Heat Pump

Models: 48VT, 48XZ

A solid packaged home comfort system that lets you warm or cool your home with a fuel-efficient electric heat pump, then turns on the high-AFUE gas furnace when the mercury dips.

• 14 SEER / 12 EER (48VT) pictured right
• 13 SEER / 11 EER (48XZ)
• 8.0 HSPF
• Up to 81% AFUE
• Puron® refrigerant
• 40,000-130,000 heating capacity
• 2-5 tons cooling capacity
• As low as 72 dB (quiet as a vacuum)
• Ideal Humidity System® and Comfort Heat Technology® Pump System features improved comfort and air quality
• Scroll compressor
• High pressure and loss of charge switches
• Corrosion resistant inducer assembly with stainless steel shaft
• Louvered grille (48XZ)
• Wired grille (48VT)
• Uses Thermidistat™ control
• 10-year parts limited warranty when properly registered; 15-year parts limited warranty on aluminized heat exchangers; Lifetime parts limited warranty on stainless steel heat exchanger when properly registered; 5-year parts limited warranty on copper coil; 10-year parts limited warranty on optional tin plated coil

Replacement and Retrofit Department

Howell's has grown into one of the best residential service and retrofit replacement companies in Richmond. Howell's has designed a department that deals exclusively with residential and light commercial HVAC replacement work. The department consists of three sales engineers, a contract administrator, one field supervisor, and five complete installation crews who specialize in replacing existing systems, and installing new systems in existing homes and buildings. Within this framework, the installation crews are well trained and supervised to be able to adjust to the unique challenges that each project presents.

The specialization of the replacement & retrofit department has allowed us to greatly improve our service to those customers who need new systems in occupied structures. We are able to complete our work in a timely fashion with minimal interruption to your home or business lifestyle. We understand that the customer has just made a large investment and is usually apprehensive about the decision.

Assurances are given, explanation of the system is thorough, and confidence is secured through our promise of future service and commitment to excellence. But is that really enough? Well, we say, "No!" Your heating and cooling system is probably the most expensive equipment in your home. And we take that very seriously. So, when you call Howell's, you can expect:

• A friendly, low pressure consultation.
• Options that fit your style and budget.
• Tips to maximize your energy efficiency.
• Service to your schedule, not ours. 24/7/365
• And so much more!

Thank you for choosing Howell's. We look forward to helping you be your partner in total comfort. Ask the experts at Howell's a question. or Schedule a FREE Replacement Quote. Let us be "Your Partner in Total Comfort."

How Often Should I Change My Air Filters?

Inspect each month and change or clean filters as needed. Time intervals frequently vary with each family. The most important aspect of efficient operation of your heating and cooling system is proper air flow. Dirty air filters will severely limit air flow, which can cause the compressor to run continuously or overheat your heat exchanger. Dirty filters could cause a 20 percent or more increase in operating costs. The outdoor units should be free of debris to ensure uninterrupted movement of air. Check out these Filter Tips and our Guide for Indoor Air Quality.

What Type of Heat Pump is Best?

One that is installed by Howell's of course! No, seriously, the efficiency of the heat pump when used as an air conditioner is known as the Seasonal Energy Efficiency Ratio (SEER). In January of 2006 the Department of Energy enforced the increase to a 13 SEER minimum standard for all heat pump and air conditioner production. A fair method of comparing the heat pump to other heating systems is to use the Heating Seasonal Performance Factor (HSPF). The HSPF compares relative equipment efficiencies. A HSPF of 6.8 or higher is recommended.

Infinity® Series Packaged HYBRID HEAT® Dual Fuel System Carrier's Very Best Technology For Home Heating and Cooling, Models: 48XT

What happens when you unite all of Infinity's advanced technology from Carrier? Super-efficient home comfort that relies on a low-power electric heat pump until the weather calls for gas furnace heat. The quietest and most energy-efficient packaged system we offer.

• 15 SEER
• 12 EER
• 8.0 HSPF
• Up to 81% AFUE
• ENERGY STAR® approved
• Puron® refrigerant
• Hybrid capability reduces operating costs
• 40,000-130,000 heating capacity
• 2-5 tons cooling capacity
• 72 dB (quiet as a vacuum)
• Ideal Humidity System® and Comfort Heat Technology® heat pump system features for improved air quality & comfort
• 2-Stage Scroll Compressor
• Stainless steel heat exchanger
• Uses Infinity® Control for precise comfort settings
• Infinity diagnostics
• Envirotuff™ rust-proof base with integrated drain
• High pressure and loss of charge switches
• Corrosion resistant inducer assembly with stainless steel shaft
• Louvered grille
• 10-year parts limited warranty when properly registered; Lifetime parts limited warranty on stainless steel heat exchanger when properly registered; 5-year parts limited warranty on copper coil; 10-year parts limited warranty on optional tin plated coil

ENERGY STAR

As an ENERGY STAR partner, Carrier Corporation has determined that model 48XT Infinity® 15 packaged heat pumps that achieve system combinations of 14.5 SEER, 8.2 HSPF and 12.0 EER or higher meet the ENERGY STAR guidelines for energy efficiency. Proper sizing and installation of equipment is critical to achieve optimal performance. Ask your contractor for details or visit the ENERGY STAR web site.

To the original owner, the Carrier Infinity® Series Packaged HYBRID HEAT® Dual Fuel System is covered by a 10-year parts limited warranty upon timely registration of your new equipment. Stainless steel heat exchangers carry a lifetime parts limited warranty upon timely registration. Copper indoor evaporator coil is covered by a 5-year parts limited warranty. Optional tin plated evaporator coil is covered by a 10-year parts limited warranty. Ask your Carrier dealer about optional extended warranties, which may include labor. Warranty period is 5-year parts limited warranty and 20-year parts limited warranty on stainless steel heat exchanger if not registered within 90 days. Jurisdictions where warranty benefits cannot be conditioned on registration will automatically receive a 10-year parts limited warranty and a lifetime parts limited warranty on the stainless steel heat exchanger. See warranty certificate at carrier.com for complete details.

Pesticides

PESTICIDES

Sources: Products used to kill household pests (insecticides, termiticides, and disinfectants). Also, products used on lawns and gardens that drift or are tracked inside the house.

Health Effects: Irritation to eye, nose, and throat; damage to central nervous system and kidney; increased risk of cancer.

Levels in Homes: Preliminary research shows widespread presence of pesticide residues in homes.

Steps to Reduce Exposure:

• Use strictly according to manufacturer's directions.

• Mix or dilute outdoors.

• Apply only in recommended quantities.

• Increase ventilation when using indoors. Take plants or pets outdoors when applying pesticides to them.

• Use nonchemical methods of pest control where possible.

• If you use a pest control company, select it carefully.

• Do not store unneeded pesticides inside home; dispose of unwanted containers safely.

• Store clothes with moth repellents in separately ventilated areas, if possible.

• Keep indoor spaces clean, dry, and well ventilated to avoid pest and odor problems.

Indoor Air Pollutants: Radon (Rn)

Sources: Earth and rock beneath home; well water; building materials.
Health Effects: No immediate symptoms. Estimated to contribute to between 7,000 and 30,000 lung cancer deaths each year. Smokers are at higher risk of developing radon-induced lung cancer.
Levels in Homes: Based on a national residential radon survey completed in 1991, the average indoor radon level is 1.3 picocuries per liter (pCi/L). The average outdoor level is about 0.4 pCi/L. Steps to Reduce Exposure: 

• Test your home for radon, it's easy and inexpensive. 
• Fix your home if your radon level is 4 picocuries per liter (pCi/L) or higher. 
• Radon levels less than 4 pCi/L still pose a risk, and in many cases may be reduced. 
• If you want more information on radon, contact your state radon office, or call 800-SOS-RADON.

Can I Move the Thermostat on My Heat Pump Up and Down Like Other Heating Systems?

During the heating season, we recommend a setting that is comfortable for your household. Once your thermostat is set, the best policy is to leave it alone. Raising the thermostat as little as 2 ° F may cause the supplementary heat to come on, thereby increasing your energy usage. Although night setback is recommended during the winter for most types of heating systems, to save energy and reduce costs, it is not generally recommended for a heat pump unless a programmable thermostat designed expressly for a heat pump is used. When you have a heat pump, and raise the house temperature in the morning, the supplementary heat may come on using more electricity than you save during the night. Reduce the thermostat temperature setting for weekend trips or vacations during the heating season.

What Are Some Ways to Help Control My Heating and Cooling Costs?

Once the thermostat is set, it should be left alone. However, programmable thermostats are commonly installed on systems to setback the house temperatures while you are away from your home. The air filters inside the system need to be checked, cleaned, or changed each month. The outdoor fan should not be covered or obstructed, so it can receive proper air flow. Precision Tune Up checks should be performed which include refrigerant level checks, indoor/outdoor coil inspections (cleaning, if needed) and duct inspections. Duct inspections are very important. A poorly performing duct system can cause air comfort problems, high utility bills, and could become hazardous. We can measure your entire system's performance and show you how to get the most out of your heating and cooling system.

Why Should I Invest in a 13 SEER or Higher Unit?

There are 13 reasons why you should purchase a heat pump/air conditioner carrying a 13 SEER rating or higher:

1. 13 SEER or higher units are 20% to 50% more efficient than 10 SEER units, saving you energy dollars through every season of the year. 
2. They are much quieter than 10 SEER units, which makes your home a more pleasant place to live. 
3. They have a 5 to 10 year compressor warranty and up to five years full parts, labor, materials and freon warranty, which ensures that the costs to run this unit are low. (Ask your contractor for details)
4. They are built better and have a much nicer fit and finish. 
5. 13 SEER or higher units are fitted with much better controls and protective devices to protect the unit if a problem occurs (bad power, refrigerant loss, etc.) 
6. 13 SEER or higher units have a new high tech scroll compressor which is extremely reliable and provides warmer feeling heat. 
7. They have a 5 minute time-delay to keep heat from turning on and off during storms, or if someone is tampering with the thermostat. 
8. They have commercial grade service valves to keep service costs down and equipment life high.
9. They have compressor sound and fan insulation systems that are attractive and significantly reduce the sound of the outdoor unit. 
10. They have a much better blower than the standard system which enhances performance and comfort. 
11. They have an expansion valve that adjusts the refrigerant flow which allows the unit to provide a higher level of comfort and better humidity control. 
12. 13 SEER or higher units have an accumulator which catches extra refrigerant and helps protect the compressor. 
13. And lastly, the Department of Energy says so!! Oh yeah! In January 2006, the DOE is raised the minimum cooling efficiency on residential air conditioners and heat pumps to 13 SEER from its older minimum of 10 SEER. Questions? Ask a Sales Consultant.

Is The Heat Pump An Economical Or Expensive Way Of Heating And Cooling, And How Does It Operate?

A heat pump may actually provide more than three units of heat for each unit of electricity used. If a kilowatt-hour of heat is needed for comfort, it can be supplied by a one thousand-watt electric heater. To provide the same amount of heat the heat pump might use as little as 330 watts in an hour. This is a ratio of three to one. The ratio is referred to as the Coefficient of Performance (COP). Electric resistance heaters have a COP of 1 because they are using electricity to create heat. A heat pump moves heat from the outside to the inside of the home and vice versa, not using energy to create heat. We recommend. a COP of at least 1.8 at standard test conditions of 17 ° F dry bulb and 15 ° F wet bulb.

I am sure that explanation was as clear as mud. Let's look at it this way. Gas and fuel oil prices are going through the roof. It looks like the heat pump is becoming a better option.

Mitsubishi Lossnary Energy Recovery Ventilators

Lossnay energy recovery ventilators provide outdoor air solutions for indoor environmental quality. Maintain an adequate supply of ventilation air while reducing energy costs. Recover up to 70 percent of sensible and latent energy from conditioned air as it is exhausted. Reduce extremes in humidity that can encourage mold growth. Remove dangerous gases, bacteria, and other airborne impurities from conditioned air. Mitsubishi Electric’s Lossnay® energy recovery ventilators offer: Unprecedented energy transfer in a fixedplate component with no moving parts. Reasonable paybacks and reduced peak demand. Superior part-load performance, reducing latent load even at mild outdoor temperatures. No wheels to stop turning so outside air is always preconditioned and available. Improved sound attenuation makes Lossnay® units quiet enough for places where silence is a must, such as meeting rooms and libraries. A free-cooling function is standard to help reduce costs and boost efficiency. The integrated, bypass damper design makes installation and system management quick and efficient.