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

AC Installation in Summerville, SC

A new air conditioner in Summerville will run from May through October every year. Tell us about the house, and a licensed contractor who covers Dorchester County will get in touch.

Tell us about the job

It takes about a minute.

Step 1 of 3: Equipment
An outdoor air conditioning condenser unit positioned beside a blue-sided house at sunset.

Six months of real heat is a lot to ask of one unit

Summerville needs air conditioning May through October, six months a year, with summer afternoons averaging 91°F. A new unit spends most of the warm season running, not resting.

The outdoor condenser sits through whatever the sky does too. Dorchester County has logged 227 damaging wind events and 44 hail events over the past ten years, with hail up to 2 inches across. Any central air conditioner installed new now has to meet the federal minimum of 14.3 SEER2, so that much is settled no matter which system goes in.

6 months
May through October, your air conditioner is on duty
91°F
the average summer afternoon it cools against
44 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 cutaway illustration of a house showing interior ductwork, an air handler and furnace unit, and an outdoor condenser connected by lines outside the wall.
Your air conditioner works hardest from June through September.

NOAA nClimDiv, 1991–2020 normals

Aerial view of a square outdoor air conditioning condenser unit on a concrete pad beside a house wall with a sliding glass door.

A higher-efficiency unit would save about $30 a year to run in Dorchester County compared with a new unit at the federal minimum.

  • A higher-efficiency unit$410 a year
  • A new unit at the federal minimum, 14.3 SEER2$440 a year

Estimates for a typical Dorchester County home, from EIA household energy data, South Carolina 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 square footage alone. A contractor looks at your insulation, your windows, your duct layout, and how much shade your house gets before landing on a number. Guessing high doesn't help either. An oversized unit cools the air fast but shuts off before it pulls the humidity down, so the house feels clammy even at the right temperature. With summer afternoons here running around 91°F for six months of the year, getting that sizing right matters more than it would somewhere with a short cooling season.
Should I replace the whole system or just the outdoor unit?
In most cases you replace the outdoor unit and the indoor coil together. The two are matched to work as a pair, and pairing a new condenser with an old coil usually means you lose efficiency and can void the manufacturer's warranty. If the outdoor unit is old enough to be failing, the indoor coil is usually not far behind. A contractor can check the age and condition of the coil and tell you whether it's worth keeping.
Do HVAC contractors in Summerville need a state license to work on my home?
A contractor should be able to show you a current license before any work starts. Ask for the license number and confirm it before you sign anything. A licensed contractor is also who handles permits and inspections, and those protect you if something goes wrong with the work later.
Find a contractor