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The condenser vents heat absorbed from the refrigerant as it pipes cool refrigerant to the fan-and-coil system inside the house. An undersize unit won't be able to cool rooms down completely on the hottest days and will cost more to operate because it has to run longer than a correctly sized unit.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.But adding central air is easier and less costly than you might think.
Some cooling contractors might suggest using "flex duct" (a small, inexpensive flexible hose) instead of rigid square ducts.
You can, however, hide the condenser in the landscaping, as long as air can freely circulate around it. No Problem Most central air conditioners are split systems: The condenser is outside and the fan-and-coil system is inside, connected to the condenser by pipes that run up the outside of the house.
The pipes can be disguised as part of the gutter-and-downspout system.
The result is a room that doesn't seem as cool as the temperature indicates. The SEER rates how many Btu an air conditioner will remove for each watt of electricity it consumes. Federal law requires that new A/C units have a SEER of at least 13. A "package system" gangs the condenser, which cools the refrigerant and exhausts warm air, with the fan-and-coil system, which cools and blows the air. This is essentially a large wall air conditioner with ducts. With a "split system," the condenser is outside the house and the fan-and-coil system are inside; they're connected to each other by pipes that carry refrigerant.
These units have lower operating costs, tend to be higher quality, have more safety features, better sound shields and lower voltage requirements. If you have a forced-air furnace, the refrigerant pipes are connected to a cooling coil system fitted into the furnace air handler. If that won't work because of space limitations, the contractor will fabricate a separate sheet-metal plenum.