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

AC Installation in Rockland, ME

A new air conditioner in Rockland will run from July through July every year. Tell us about the house, and a licensed contractor who covers Knox County will get in touch.

Tell us about the job

It takes about a minute.

Step 1 of 3: Equipment
An overhead view of a residential air conditioning condenser unit mounted on a concrete pad next to a house with vinyl siding.

Rockland doesn't ask much of an air conditioner

Summer afternoons here average 74°F. That's mild compared to most of the country, and it means a new system spends its season working less hard than one installed further south or further inland.

Any new central air conditioner installed today has to meet 13.4 SEER2, the federal minimum. In a climate this mild, that efficiency floor covers most of what your house will ask of it.

1 months
July through July, your air conditioner is on duty
74°F
the average summer afternoon it cools against
6 hail events
in ten years, and hail bends the fins on outdoor coils
13.4 SEER2
the federal minimum any new unit must meet
Isometric illustration of a cutaway single-story house showing interior rooms, ductwork running from an indoor air handler, and an outdoor condenser unit on a pad beside the building.
Your air conditioner works hardest from July through July.

NOAA nClimDiv, 1991–2020 normals

An outdoor air conditioning condenser unit on a concrete pad next to the gray vinyl siding of a residential home.

Going above the federal minimum saves little here, about $20 a year.

  • A higher-efficiency unit$120 a year
  • A new unit at the federal minimum, 13.4 SEER2$140 a year

Estimates for a typical Knox County home, from EIA household energy data, Maine fuel prices and NOAA climate normals. Your home will differ.

What size air conditioner does my house need?
The right size comes from a load calculation, not a rule of thumb based on square footage. A contractor measures your windows, insulation, ceiling height, and how much sun your walls get, then runs the numbers to find the tonnage your house actually needs. Too big and it cools the air fast but never runs long enough to pull out the humidity. Too small and it runs constantly without keeping up on the hottest afternoons.
Should I replace the whole system or just the outdoor unit?
If your indoor coil and outdoor unit were installed together and are close in age, replacing just the outdoor unit usually causes problems. The coil and the condenser are matched to work at specific pressures, and pairing an old coil with a new condenser can hurt efficiency or shorten its life. A contractor can check your coil's condition and tell you whether it can handle a new unit or whether both need to go at once.
Do HVAC contractors in Rockland need a state license to work on my home?
Yes. Anyone installing or servicing central air conditioning on your home needs a state HVAC license. Ask to see it before work starts, and check that it's current. This protects you if something goes wrong with the installation later.
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