ROANOKE TIMES
Copyright (c) 1996, Roanoke Times
DATE: Sunday, July 7, 1996 TAG: 9607090009
SECTION: HOMES PAGE: D-1 EDITION: METRO
COLUMN: Cut Your Utility Bill
SOURCE: JAMES DULLEY
Q: Our 10-year-old central air conditioner does not keep us as comfortable as it used to and our electric bills are high. What's new for 1996 and will installing a new high-efficiency model improve comfort, too?
A: Installing a new central air conditioner can lower the cooling portion of your utility bills by up to 40 percent. Even if your old air conditioner still works, you may save money overall by installing a new one now.
The improvement in comfort from installing a new super-efficient air conditioner varies among the various designs. Do not just select the unit with the highest SEER (efficiency rating) if comfort, along with lower electric bills, is a concern.
The newest super-efficient multilevel output central air conditioners offer the best comfort. These have sensors and microprocessors that constantly fine tune the cooling output to the changing comfort conditions in your home.
In the super-efficient low-output cooling level, the air conditioner runs longer. This keeps cool air slowly circulating and the blower runs at a quieter low speed. It also cleans the air better for allergy sufferers.
The best three-level models use two different-size compressors. During mild weather, only the small compressor runs. In moderately hot weather, only the medium size compressor runs. In severely hot weather, both run.
Two-level models, that use a single two-speed compressor, are available. Eighty-percent of the time, these run at the super-efficient low speed. The controls automatically sense when it needs to switch to the higher speed.
The most reasonably-priced super-efficient air conditioners use a one-level compressor design. These have efficiency ratings as high as the multilevel designs and save almost as much on your electric bills.
Many new central air conditioners use scroll compressors. These are very efficient, trouble-free and quiet. This unique compressor design uses a simple wobbling mechanism instead of reciprocating piston. Fewer moving parts are needed and it actually operates better the older it gets.
Some single-speed and all multilevel air conditioners use variable-speed direct current blower motors. These use less than half as much electricity as a standard blower motor - an extra savings as high as $300 per year.
Variable-speed allows for soft start of the blower. Instead of hitting full speed at once each time it comes on, a variable-speed blower ramps up slowly to full speed. This is quieter and cuts down on drafts year-round.
For a buyer's guide of 22 super-efficient central air conditioners listing efficiency ratings, comfort features, output levels, type of compressor and blower motor, warranties and a payback savings chart, write to James Dulley, The Roanoke Times, 6906 Royalgreen Dr., Cincinnati, Ohio 45244. Ask for Update Bulletin No. 510. Please include $2 and a business-size self-addressed stamped envelope.
LENGTH: Medium: 56 linesby CNB