HVAC Installation in Charleston, SC
A new system here will heat from November through March and cool from May through October every year. Tell us about the house, and a licensed contractor who covers Charleston County will get in touch.
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Charleston asks for both, most of the year
A system here works eleven months out of the year. Summer afternoons average 89°F from May through October, six months of the compressor running hard to keep up. Winter turns mild but not warm, with nights averaging 41°F from November through March, five months where the heat has to hold.
Most homes here heat with electricity, so the same power supply carries the load in both seasons. Charleston County has logged 304 damaging wind events over the past ten years, and in 2024 nearly half of South Carolina households lost power for at least a day. A new system should start back up on its own once the power does, without anyone having to reset it by hand.
- 5 months
- November through March, your system heats
- 6 months
- May through October, it cools
- 41°F
- the average winter night it heats against
- 89°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
- When should I replace my HVAC system?
- Once your system is old enough that repairs are getting frequent, replacement usually makes more sense than another repair bill. A furnace or air conditioner nearing the end of its life tends to break down more often, and each repair is money spent on a machine that's still getting closer to done. If yours is still running fine and hasn't needed much attention, a repair still makes more sense than replacing it early. Watch for rooms that won't hold temperature, a system running long cycles, or bills climbing without a reason.
- Should I replace my furnace and air conditioner at the same time?
- If they're close in age, yes, it's worth doing both together. A furnace and air conditioner installed at the same time are matched to work with each other, and pairing an old unit with a new one can mean the newer one never runs the way it's supposed to. If one is much newer than the other, there's less reason to replace it early just to match. A contractor can look at the age and condition of both and tell you whether it makes sense to do them together for your house.
- What happens during an HVAC installation?
- The old furnace or air conditioner comes out first, along with anything tied to it that isn't being reused, like a worn thermostat or damaged ductwork. The new equipment goes in, gets connected to the ducts, the electrical, and for a furnace, the gas line or fuel source. Refrigerant lines are run and charged for an air conditioner or heat pump. Once everything is connected, the system gets tested and the settings are adjusted so it's running the way it should before anyone leaves. A contractor can walk you through what your specific installation will involve.