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A few steps to a healthy HVAC system...
Buy a better filter if you haven’t already. The new high-efficiency pleated filters have an electrostatic charge that works like a magnet to grab the tiniest particles — even those that carry bacteria.
Replace the filter at least every 90 days. But check it monthly. If it looks dark and clogged, go ahead and change it. If you have pets, you’ll probably need to change every month.
Check to make sure there’s at least two feet of clearance around outdoor air conditioning units and heat pumps.
Weekly during spring, summer, & fall remove debris such as leaves, pollen, & twigs from top & sides of outdoor air-conditioning units & heat pumps. Don’t allow the lawn mower to discharge grass clippings onto the unit.
Have the insulation on refrigerant lines leading into house inspected. Replace if missing or damaged.
Annually, ensure that outdoor air-conditioning units and heat pumps are on firm and level ground or pads.
Never close more than 20% of a home’s registers to avoid placing unnecessary strain on the HVAC system.
Annually, replace the battery in your home’s carbon monoxide detector.