Maintaining good indoor air quality in your Tallahassee home is important for the health and comfort of your family, and an effective home ventilation system contributes to this. Older homes that weren’t built with energy efficiency in mind get enough natural ventilation from air leaks around doors and window, as well as through cracks between walls, floors and ceilings. But new, energy-efficient homes require mechanical ventilation systems to keep the right amount of fresh air moving through the home.
There are three popular methods for providing home ventilation: exhaust-only systems, supply-only systems and balanced systems. Each type of home ventilation system has advantages and disadvantages, so discuss your home-building or remodeling ideas with your HVAC contractor to plan the best solution for your situation. The following brief descriptions of the types of systems will help get you started.
An exhaust-only system uses exhaust fans to suck air out of your house. They create negative pressure inside your house which is balanced by air infiltration through air leaks in the building structure.
Low cost is the only real advantage to an exhaust-only system. Since you can ventilate your home using fans that have to be installed anyway, such as in bathrooms and in the kitchen, there’s no additional cost involved.
There are several big disadvantages to the exhaust-only approach, though:
A supply-only ventilation system uses a fan to blow air from outside into your house. This raises the pressure inside the building, and air flows out around doors and windows and through small openings in the building structure to balance the pressure. Supply-only systems have some advantages over exhaust-only systems:
Balanced ventilation systems blow air into the house at the same time that air is being exhausted out of the house. Balanced systems offer many benefits:
Balanced systems as well as supply-only systems can use your existing heating and air conditioning ductwork, but there are good reasons to have separate ducts for ventilation. The heating and air conditioning blower is too large for the amount of air you need to move for effective ventilation, so a separate blower will improve system efficiency. You can design a ventilation system to work well with existing ductwork with the A/C or heat on, or with the A/C or heat off, but not for both situations.
For the design, installation and maintenance of an effective home ventilation system anywhere in the Tallahassee area, contact us at Air Control Heating & Cooling.