AC Installation in Florissant, MO
A new air conditioner in Florissant will run from May through September every year. Tell us about the house, and a licensed contractor who covers St. Louis County will get in touch.
Tell us about the job
It takes about a minute.
Five months of cooling, every year
Florissant summers average 87°F in the afternoon, and that runs from May through September. A new air conditioner here has five months of real work ahead of it every year, not just a few scattered hot days. That kind of season is why sizing and installation matter as much as the equipment itself.
Any central air conditioner installed new today has to meet a federal minimum of 13.4 SEER2. That is the efficiency floor every unit starts from, so what sets one installation apart from another is how well the system is matched to the house and how it is put in.
- 5 months
- May through September, your air conditioner is on duty
- 87°F
- the average summer afternoon it cools against
- 77 hail events
- in ten years, and hail bends the fins on outdoor coils
- 13.4 SEER2
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A higher-efficiency unit would save about $30 a year to run in St. Louis County compared with a new unit at the federal minimum.
Estimates for a typical St. Louis County home, from EIA household energy data, Missouri fuel prices and NOAA climate normals. Your home will differ.
- What size air conditioner does my house need?
- The right size depends on your home's square footage, how much shade and sun it gets, how well it's insulated, and the layout of the ductwork, not on a rule of thumb. A contractor works this out with a load calculation, a room by room look at what the house needs to hold steady on a 87°F afternoon without running nonstop or short cycling. An oversized unit cools the air fast but shuts off before it pulls the humidity down, and an undersized one runs all summer without keeping up. Get a contractor out to measure your house and calculate it rather than sizing off the unit you have now or what a neighbor has.
- Should I replace the whole system or just the outdoor unit?
- If your indoor coil and outdoor unit are more than a few years apart in age, replacing just the outdoor unit usually isn't the better move. The coil and the condenser are matched to work together, and pairing an old coil with a new condenser can mean the system never hits the efficiency or cooling capacity it's rated for. New central air conditioners have to meet a 13.4 SEER2 minimum now, and that rating assumes the whole matched system, not one new part bolted onto an old one. A contractor can check whether your coil is still compatible with a new condenser before you decide.
- Do HVAC contractors in Florissant need a state license to work on my home?
- Ask to see a contractor's license number before any work starts on your home, and check that it's current. A licensed contractor also carries the insurance that protects you if something goes wrong during the job. If you're not sure what licensing applies where you live, the contractor should be able to tell you and show proof.