Updating duct work in older homes dating jensen speakers code
In general, the higher the SEER, the higher the initial cost for the unit. If you don't have forced air, the fan-and-coil system is typically placed in the attic, where it will deliver cool air through ducts.The 20- to 30-foot-long pipes that carry the refrigerant are disguised to look like a downspout. Even the quietest condensers make noise, so work with your contractor to find a location that's not near a bedroom or home-office window.But adding central air is easier and less costly than you might think.When added to an existing forced-air heating system, central air for a 2,000-square-foot home costs ,500 to ,000 and can be done by two technicians in two to three days, often with little or no change to the ducting.By making your home more energy efficient, you may be able to reduce the size of the air conditioner you need.A split-system condenser sits outside, free of any obstructions to airflow.
Using the heat-gain calculation, your contractor will recommend an air conditioner size, expressed either in tonnage or Btu per hour (Btu/h). An oversize compressor also costs more to operate because it simply takes more electricity to run a bigger unit.
Don't place the condenser under a deck or completely enclose it because it exhausts warm air out the top.
Any airflow restriction will lower the unit's efficiency.
Selecting a Unit The first order of business — and maybe the most important decision in having central A/C installed in your home — is selecting the right equipment. All cooling contractors should start their evaluation of your house by performing an Air Conditioning Contractors of America Manual J load calculation.
This determines the heat gain your home is subject to.
Furnace ducts that deliver hot air in cold months can be used for air-conditioning. Ironically, older duct systems, which tend to be larger, work best when retrofitting central air-conditioning.