Studies conducted by the EPA (Environmental Protection Agency) reveal that most indoor spaces are two to five times more polluted than the air outdoors. Coupled with the fact that most people spend about 90% of their time indoors, homeowners need to understand the importance of maintaining good indoor air quality. In today’s post, the HVAC contractors at HVAC Construction, Inc. take a look at the parts of the house that typically have poor indoor air quality, and what you can do to improve them.