A heat pump filter works much like the air filter in your car, and prevents dust and debris from being sucked into your heat pump. A filter that has become clogged with detritus will restrict air flow into your heat pump, reducing the amount of heating and cooling that it can provide your home and causing it to work harder, increasing your energy usage. Thankfully, replacing a heat pump filter is a fairly simple process that can be completed in just a few minutes with the right know how.

What You'll Need

You'll need a screwdriver, most likely a crosshead, and a replacement air filter (the exact specifications of which can be found in the owner's manual). If you've misplaced the owner's manual, simply take in the old filter to the hardware store to find a replacement that will fit into your heat pump. You'll also need a bucket of warm water and a cleaning rag.

Replacing a Heat Pump Filter

Turn off the power supply to the heat pump to prevent any accidents from happening.

Find and remove the access door on the side of your heat pump. It will usually be held in place with screws, which will need to be removed with the screwdriver, though some models have their access doors held on with simple hooks that can be undone by hand. Store the screws somewhere safe for later.

Remove the air filter from the heat pump. It should be located immediately inside the heat pump, below or next to the air blower.

Clean out the heat pump using the rag, being sure to wipe away any built up dust or dirt on the interior of the heat pump. Built up debris can be a breeding ground for mold and mildew, which the heat pump will then distribute throughout your home if left unchecked.

Slide the new filter into the heat pump. There should be arrows on the plastic casing around the filter that indicate which way it should be inserted.

Wipe down the access door if needed, and then replace it on the heat pump.

Turn the power back on to your heat pump. You've now successfully cleaned your heat pump and replaced the filter. In order to ensure the efficient operation of your heat pump, you should check your filter every three months (roughly at the same time as the seasons change) and replace it if needed. For assistance, talk to an HVAC repair professional.