An outdoor central air conditioning unit mounted on a concrete pad beside a blue-sided house at sunset.

AC Maintenance in Boston, MA

Air conditioners here run from July through August, so June is the time for a tune-up. Tell us about your system, and a licensed contractor who covers Suffolk County will get in touch.

Tell us about the job

It takes about a minute.

Step 1 of 3: Equipment

What kind of equipment?*

An outdoor air conditioning condenser unit positioned beside a blue-sided house at sunset.

Two months of work, then ten months of sitting still

Your air conditioner in Suffolk County only runs in July and August, when afternoons average around 80°F. For the other ten months it sits idle. That is hard on the parts that have to start it back up. A capacitor that sat all winter can weaken enough that it no longer kicks the compressor on. A contactor can pick up corrosion in that time and stop making good contact.

The outdoor unit has also had to sit through some rough weather. Suffolk County has logged 140 damaging wind events and six hail storms over the past ten years, with hail up to 2 inches across. Wind and hail can bend the fins on the outdoor coil or drive debris into it, and either one cuts down the airflow your system needs without any sign of it from inside the house. A tune-up before summer catches a weak capacitor or a bent coil before the first hot afternoon puts the system to work.

2 months: July through August, your air conditioner is on duty
80°F: the average summer afternoon it cools against
6 hail events: in ten years, and hail bends the fins on outdoor coils
140 wind events: in ten years, and wind drives debris into outdoor units

Isometric cutaway illustration of a single-story house showing interior rooms, ductwork and an air handler in the attic space, and an outdoor condenser unit connected by lines at the exterior wall.

Your air conditioner works hardest from July through August.

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NOAA nClimDiv, 1991–2020 normals

Overhead view of a gray residential air conditioning condenser unit mounted on a concrete pad beside a house with asphalt shingle roofing.

Book your AC tune-up in June, before homes here start needing cooling in July.

A tune-up checks the refrigerant charge, cleans the coils, tests the capacitor and tightens the electrical connections.

What does AC maintenance include?: A technician checks refrigerant charge, cleans the condenser coil outside, and tests the capacitor and contactor that start the compressor. They also check the coolant lines, look at the condensate drain for clogs, and change or clean the filter. On top of that, they check the thermostat is calling for cooling correctly and the system is actually cooling the air it pulls in. Boston summers only push the system hard for about two months, but that visit still catches the parts that wear from sitting idle the rest of the year.
How often does an air conditioner need maintenance?: Once a year, ideally in spring before it has to run. That gives a technician time to catch a weak capacitor or a dirty coil before the first hot week hits. In Boston, cooling season really only runs July through August, so a spring check means the system sits ready for those two months instead of getting caught off guard.
Is AC maintenance worth it?: Yes. A yearly check catches small problems, a failing capacitor, a low refrigerant charge, before they turn into a system that will not start on a 80°F afternoon. It also keeps the coil and filter clean enough that the system is not working harder than it needs to move air through the house. Boston's cooling season is short, so a system that gets skipped one year can sit neglected for a long stretch before anyone notices.

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