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Old April 25th, 2016, 12:42 PM
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Join Date: Nov 2011
Default Re: Centralised AC System

Central air conditioners circulate cool air through a system of supply and return ducts. Supply ducts and registers (i.e., openings in the walls, floors, or ceilings covered by grills) carry cooled air from the air conditioner to the home

Other features to look for when buying an air conditioner include:

A thermal expansion valve and a high-temperature rating (EER) greater than 11.6, for
High-efficiency operation when the weather is at its hottest

A variable speed air handler for new ventilation systems

A unit that operates quietly

A fan-only switch, so you can use the unit for nighttime ventilation to substantially
Reduce air-conditioning costs

A filter check light to remind you to check the filter after a predetermined number of
Operating hours

An automatic-delay fan switch to turn off the fan a few minutes after the compressor
Turns off.


When installing a new central air conditioning system, be sure that your contractor:

Allows adequate indoor space for the installation, maintenance, and repair of the new system, and installs an access door in the furnace or duct to provide a way to clean the evaporator coil

Uses a duct-sizing methodology such as the Air Conditioning Contractors of America (ACCA) Manual D

Ensures there are enough supply registers to deliver cool air and enough return air registers to carry warm house air back to the air conditioner

Installs duct work within the conditioned space, not in the attic, wherever possible

Seals all ducts with duct mastic and heavily insulates attic ducts

Locates the condensing unit where its noise will not keep you or your neighbors awake at night, if possible

Locates the condensing unit where no nearby objects will block airflow to it

Verifies that the newly installed air conditioner has the exact refrigerant charge and airflow rate specified by the manufacturer

Locates the thermostat away from heat sources, such as windows or supply registers.
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