Whole-house air purification systems are available, but they are tied into the heating ... is the clean air delivery rate (CADR). This is the amount of clean air your device will re-circulate.

Clean filters let more air pass through ... A carbon monoxide detector is an essential safety device in homes with combustion-based heating systems such as natural gas or fuel oil.

(An HVAC tuneup is different from air duct cleaning.) But some tuneups may require ... heating and cooling systems and humidification devices as a pollutant, and the agency says on its website ...

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