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.