As the summer comes, experts give cooling advice

As summer heat approaches, many homeowners consider installing air conditioning to make their home more comfortable.


For some, central air is the answer. Here are a few tips for those considering this option:

When buying a new system, check its Seasonal Energy Efficiency Rating (SEER). A high SEER indicates a more energy-efficient air conditioner. New air conditioners sold in Canada have SEERs ranging from 10 to 17, with 17 being the most energy efficient and 10, the least.


The refrigerant used in the unit should also be a consideration. The two types available are R-22 (Freon) and R-410A (Puron).

Until recently, Freon was the only refrigerant used in air conditioners. But it contains chlorine compounds that, if released by normal wear and tear or equipment failure, destroy the ozone layer and contribute to global warming.

Recent international agreements have created a plan to halt Freon production in the next few years. This has cut the world supply and raised its cost.

Puron does not share Freon's ozone-depleting properties.

Both Freon and Puron air-conditioning systems are available. Consider the Puron option when you're installing a new system or repairing an older one.

Once installed, it is important to keep your central air conditioner in good working condition. Here are a few suggestions:


Inspect and clean or replace the blower fan filter (usually found in the return air duct at the furnace) every two months or as recommended by the manufacturer.


Vacuum or brush the outdoor coil to keep it clear of dirt, leaves and grass clippings. It then can be carefully rinsed with a hose.


The blower fan and outdoor fan should be cleaned and lubricated, as applicable, following manufacturer's instructions.


If there's a humidifier damper, close it for the summer to avoid unnecessarily adding moisture-laden air to the home.

If, after following these tips, your air conditioner still perf-orms poorly, have a qualified contractor do a more thorough servicing.

As with all mechanical equipment, regular servicing by a qualified contractor in accordance with the manufacturer's specifications is recommended.

Don't test the air conditioner when the outdoor temperature is below 18 C, or has been below 18 C in the last 24 hours, or if the power has been on for less than 12 to 24 hours. In these conditions, refrigerant in the compressor can mix with lubricating oil, potentially causing the compressor to seize.

The compressor is the heart of the system and the most expensive component to replace, so it's important to observe the restrictions above.

Indeed, the life expectancy of an air conditioner is often tied to that of its compressor. In Canada, the life expectancy of an air conditioner compressor should be on the order of 12 years.

Other maintenance issues to consider:


Make sure the winter cover is removed before turning on the air-conditioning unit.


Make sure there's nothing -- bushes, trees, structures, etc. -- obstructing airflow around the outside of the unit.


When winterizing your air conditioner, shut off power to the unit to prevent it being turned on by accident.

Aside from installing an air conditioner, there are other steps you can take to help lower temperature inside your home, such as:


Shelter windows with awnings and shrubbery and close blinds on hot, sunny days.


Install compact fluorescent lighting, which produces less waste heat.


Keep lights and computers turned off when possible.


Cook outdoors.


Dry clothes outside rather than using a heat-producing dryer inside.