Re: My House IS Killing Me!
Originally Posted by silkwj
There are several HVAC technologies for improved indoor air quality on the market today. Heat Recovery Ventilators (HRV), Energy Recovery Ventilators (ERV), special filtration devices, Demand Control Ventilation and Displacement Ventilation systems.
The HRV will take a percentage of the indoor air and exhaust it in exchange for outdoor air. The thermal energy from the already conditioned exhaust air will be used to pre-treat the outdoor air coming into the system. So, in the summer, outdoor air is pre-cooled; while in the winter months, outdoor air is pre-heated. This is a great way to conserve energy and lower your utility bills while improving the operation of your HVAC system.
The ERV works similar to the HRV except in addition to thermal energy being transfered from the conditioned exhaust air to the outdoor air latent energy (moisture) is transfered. So, in the humid summer, outdor air is pre-cooled and dehumidified; while in the dry winter months, outdoor air is pre-heated and humidified.
ERV are strongly recommended in hot/humid and mixed/humid climates; recommended in some cold and marine zones that can experience higher humidity in summer months; but are not generally recommended in hot/dry, mixed/dry, very cold and subartic climates.
Both of these systems can be fitted to your HVAC system, but by themselves they are not enough. Have your HVAC contractor or local Indoor Environmentalist take a look at the operation of the system. Making sure ventilation, air flow, and pressurization are correct go a long way in comfort and indoor pollution control. Also, ask your professional about the proper filtration system for you and your unit. There are many different ways to do a good filtration of your system; and, unfortunately, there are also some bad ones.
Jason Yost, CIEC, CMRS, WRT
Council-certified Indoor Environmental Consultant
Council-certified Microbial Remediation Supervisor
Water-damage Restoration Technician