HVAC Installation in Arnold, MO
A new system here will heat from October through April and cool from May through September every year. Tell us about the house, and a licensed contractor who covers Jefferson County will get in touch.
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A system that has to work both ends of the year
Arnold homes need heat or cooling all twelve months. Heat runs October through April, seven months, with winter nights averaging 25°F. Cooling runs May through September, five months, with afternoons averaging 87°F. Whatever you install has to hold up on both ends, not just the season you're replacing it in.
57.5% of homes here heat with electricity, so a furnace or heat pump has to be sized for those cold nights, not just close to it. The area has seen 11 winter storms and 53 damaging wind events over the past ten years, and in 2024, 19% of Missouri households lost power for at least 24 hours. It's worth asking any contractor how the system handles an outage, and whether it comes back on by itself once power returns.
- 7 months
- October through April, your system heats
- 5 months
- May through September, it cools
- 25°F
- the average winter night it heats against
- 87°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
- When should I replace my HVAC system?
- Replace it when repairs start costing more than the equipment is worth or when it can no longer keep the house comfortable. An aging furnace or air conditioner works harder each year, and a breakdown during the October through April heating stretch here means dealing with 25°F nights right away. If a contractor has already recommended repairs more than once in the past year or two, that is usually the sign to start pricing a replacement instead of fixing it again.
- Should I replace my furnace and air conditioner at the same time?
- If both are old, replacing them together is often the better choice, but it depends on the condition of each one. A furnace and air conditioner installed at the same time are matched to work together, and pairing a new unit with one that has years of wear on it can mean the older one fails first anyway. Homes here need heat or cooling all 12 months of the year, so downtime on either side matters. A contractor can look at the age and condition of both and tell you whether replacing one now and planning for the other makes sense.
- What happens during an HVAC installation?
- A contractor removes the old equipment, sets the new unit, and connects it to the existing ductwork, refrigerant lines, gas line, or electrical circuit depending on what is being installed. They check the ducts for leaks or sizing problems, since a new system connected to bad ductwork will not perform the way it should. Once it is running, they test it, check refrigerant charge or gas pressure, and confirm the thermostat is talking to the new equipment correctly. The exact steps depend on whether it is a furnace, an air conditioner, or both, and a contractor can walk through what your specific job will involve.