Central (ducted) a/c provides whole-house or large-commercial-space cooling,
and typically provides moderate multi-zone temperature level control capability by the addition of air-louver-control boxes.
In central air conditioning, the inside heat-exchanger is usually put inside the main furnace/AC unit of the forced air heating system which is then used in the summer to distribute cooled air throughout a house or business building.
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Central air-conditioning systems use ducts to disperse cooled air throughout your home. The refrigerant cools the air, dehumidifying it in the process; a blower flows air through ducts throughout your home. A variation is the "heatpump," a type of system that functions as heating unit and cooler.
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Features to try to find when purchasing a central air conditioning conditioner:
An automatic-delay fan switch to turn off the fan a couple of minutes after the compressor turns off
A thermal expansion valve and a high-temperature ranking (EER) greater than 11.6, for high-efficiency operation when the weather is at its most popular
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A filter check light to advise you to inspect the filter after a predetermined variety of running hours.
A variable speed air handler for new ventilation systems
An unit that runs silently
A fan-only switch, so you can utilize the system for nighttime ventilation to substantially decrease air-conditioning costs
MINI-SPLIT (DUCTLESS) SYSTEM
A mini-split system usually provides air conditioned and heated air to a single or a couple of
spaces of a building.Multi-zone systems are a common application of ductless systems and allow as much as 8 rooms (zones) to be conditioned from a single outside system. Multi-zone systems usually use a variety of indoor unit designs consisting of wall-mounted, ceiling-mounted, ceiling recessed, and horizontal ducted. Mini-split systems normally produce 9,000 to 36,000 Btu (9,500-- 38,000 kJ) per hour of cooling. Multi-zone systems offer extended cooling and heating capability up to 60,000 Btu's.
Advantages of the ductless system include smaller size and flexibility for zoning or heating and cooling private spaces. The within wall space needed is substantially reduced. Likewise, the compressor and heat exchanger can be situated farther away from the inside space, instead of simply on the other side of the exact same system as in a PTAC or window air conditioning system. Versatile outside hose pipes lead from the outside unit to the interior one(s); these are often enclosed with metal to appear like common drainpipes from the roofing. In addition, ductless systems offer greater efficiency, reaching above 30 SEER.
The primary drawback of ductless a/c is their expense. Such systems cost about US$ 1,500 to US$ 2,000 per ton (12,000 BTU per hour) of cooling capacity. This has to do with 30% more than central systems (not consisting of ductwork) and might cost more than two times as much as window units of comparable capability.
An additional possible downside that the expense of installing mini divides can be higher than some systems, although lower operating expense and rebates or other financial incentives-- provided in some areas-- can help offset the initial cost.
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