When Should You Service Your AC in Virginia?

The best time to service your AC in Virginia is spring, before the first hot spell. In Northern Virginia that means booking now, in April: a technician can find and fix problems while the weather is mild, rather than in the first heat wave, when a visit is harder to get and a breakdown is harder to live with.

When is the best time to service an AC?

Spring, for three reasons:

• The system is checked before its hardest season, not after something has failed in it.
• A problem found in April is an inconvenience, not an emergency. You have time to compare quotes and plan a repair.
• It's easier to get a visit before the first hot week than during it.

On the Dulles side of Northern Virginia (western Fairfax, Loudoun, Prince William), a freezing night is still possible into mid-April. NOAA's 1991–2020 climate normals put the average last freeze on April 15 at Dulles and March 24 at Reagan National, as of September 2026. That doesn't rule out a tune-up. It does mean you should test the AC yourself on a warm afternoon rather than a cold morning, and check your manual for the lowest outdoor temperature it should run at.

How often should you service your AC?

Start with your system's manual and warranty papers, since some warranties require regular maintenance. If they don't say, a check once a year, before the cooling season, is the usual rhythm.

A heat pump is different. It heats and cools with the same outdoor unit, so it works hard in both winter and summer. A check before each season, in spring and again in fall, means it's looked at before each stretch of heavy use.

What does an AC tune-up include?

Visits differ, so ask what yours covers before you book. Common items include:

• checking the thermostat, and how the system responds to it;
• checking or replacing the filter;
• inspecting and cleaning the outdoor coil;
• checking the refrigerant, and looking for signs of a leak;
• checking the electrical connections and parts;
• clearing the condensate drain, which carries water away from the indoor unit;
• measuring how well the system cools once it's running.

Ask for a written list of what was found, and for any repair to be priced before it's done.

What can you do yourself before the visit?

• Replace the filter if it's due, and note its size.
• Clear around the outdoor unit. Rake out leaves and branches, trim shrubs back to the clearance your manual gives, and keep anything off the top of the unit.
• Open the vents. Make sure the supply vents and return grilles inside aren't closed or blocked by furniture.
• Check the thermostat's batteries, if it uses them.
• Look at the condensate drain. Find where the drain line ends, outside or at a floor drain, and check that it isn't blocked. Look for water around the indoor unit.
• Test-run it on a warm day. Set the thermostat to cool a few degrees below the room temperature. Listen for the outdoor unit to start, and after a few minutes feel for cool air at the vents.

Don't open the panels on either unit: the outdoor unit holds high-voltage parts. For the rest of the season's jobs, see the spring home maintenance checklist for Northern Virginia.

How should you prepare for the technician's visit?

A little preparation makes the visit quicker and the findings more useful.

• Note the make, model and age of the system. They're on the labels on the outdoor unit and on the indoor unit (the furnace or air handler). A photo of each label is enough.
• Make a clear path to the indoor unit, whether it's in a closet, the basement or the attic, and to the outdoor unit.
• Write down what you noticed last summer: rooms that stayed warm, odd noises, a system that ran for hours, or a house that felt damp.
• Say what you've already done, such as a new filter or a tripped breaker you reset, so nothing is checked twice.
• Keep pets away from the work areas during the visit.

What are the signs your AC needs repair, not just a tune-up?

Book AC repair and installation instead of waiting for the tune-up if you see:

• warm air from the vents when the system is set to cool;
• ice on the refrigerant lines or the outdoor unit;
• water pooling around the indoor unit;
• the system switching on and off again every few minutes;
• grinding, squealing or banging noises;
• a burning or musty smell;
• a breaker that trips when the AC starts.

If you smell burning, switch the system off at the thermostat before you call.

A house that feels cool but clammy is worth mentioning too. An AC dries the air as it cools it, so damp that lingers through the summer is a sign something isn't working as it should. For a thermostat that misreads the room, or a home that stays humid, book thermostats and indoor air.

Who can service an AC in Virginia?

HVAC work done for pay needs a tradesman license from DPOR, the Department of Professional and Occupational Regulation, at journeyman or master level, or the supervision of someone who holds one (Va. Code § 54.1-1129, as of September 2026). A business that contracts HVAC work worth more than $1,000 also needs a DPOR contractor license, and an HVAC contractor must have a master tradesman (Va. Code § 54.1-1100).

Before you book, look up the technician's or the company's license for free on DPOR's License Lookup. This is general information, not legal advice; confirm with DPOR.

What if the technician recommends a new system?

Ask why, and ask for the answer in writing: the system's age, what's failing, and what a repair would involve instead. Get more than one quote for a replacement, and ask whether the job needs a permit in your county or city, and who will pull it.

A licensed Virginia contractor's residential contract must be written and signed by both parties before work starts or any payment is taken. Among other things, it must list the start and estimated completion dates, the total cost and the payment schedule (18VAC50-22-260, as of September 2026).

Book the tune-up before the heat arrives

Book HVAC maintenance with an independent local Pro this spring, before the first hot week.

Last updated September 2026.