AC Installation in Arnold, MO
A new air conditioner in Arnold will run from May through September every year. Tell us about the house, and a licensed contractor who covers Jefferson County will get in touch.
Tell us about the job
It takes about a minute.
Five months of Arnold summers
Your air conditioner works from May through September here, five months a year, with summer afternoons averaging 87°F. That is the stretch it has to handle every year without a break.
Arnold has also seen 49 hail events and 53 damaging wind events over the past ten years, with hail up to 3 inches recorded. An outdoor unit sits exposed to that weather. Any new system installed today has to meet the federal minimum of 13.4 SEER2, so whatever goes in will already meet that standard.
- 5 months
- May through September, your air conditioner is on duty
- 87°F
- the average summer afternoon it cools against
- 49 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 Jefferson County compared with a new unit at the federal minimum.
Estimates for a typical Jefferson 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?
- There's no single number that works for every house. The right size depends on your square footage, ceiling height, insulation, window placement, and how much shade your house gets in the afternoon. A unit that's too big will cool the air fast but shut off before it pulls the humidity out, so the house feels damp. A contractor will do a load calculation on your actual house to find the right size, not just measure the old unit and match it.
- Should I replace the whole system or just the outdoor unit?
- If your outdoor unit is failing but the indoor coil and furnace or air handler are still in good shape, replacing just the outdoor unit can make sense. But the indoor and outdoor parts of a central air system are matched to work together. Put a new outdoor unit on an old indoor coil and you can lose efficiency or run into compatibility problems, especially with refrigerant type. A contractor can look at the age and condition of both halves and tell you whether a matched pair makes more sense for your situation.
- Do HVAC contractors in Arnold need a state license to work on my home?
- Yes, HVAC contractors need a state license to install or work on central air systems. Ask to see the license before any work starts, and confirm it's current. A licensed contractor also carries insurance, which matters if something goes wrong during installation.