HVAC Installation in Greenville, MS
A new system here will heat from November through March and cool from May through September every year. Tell us about the house, and a licensed contractor who covers Washington County will get in touch.
Tell us about the job
It takes about a minute.
Ten months a year, one system or the other is running
Winter nights here average 37°F from December through February, and homes need heat from November through March, five months of the year. Summer runs the other way, with afternoons averaging 91°F, and cooling season stretches from May through September, another five months. That leaves ten months where your heating or cooling system is doing real work.
A new system here has to hold up on both ends of that. Storms are part of the picture too. Washington County has logged 84 damaging wind events and 6 winter storms over the past ten years, and statewide, 30% of households went at least 24 hours without power in 2024. Whatever gets installed should be sized right for the heat and the cold it will face, and it should come back on by itself once the power does.
- 5 months
- November through March, your system heats
- 5 months
- May through September, it cools
- 37°F
- the average winter night it heats against
- 91°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
Mississippi requires HVAC contractors to hold a state license.
The State Board of Contractors is the one that licenses HVAC contractors in Mississippi, and that license belongs to the contractor, not to any single job. It covers the contractor's standing to do this work at all, before they ever get to Washington County.
For a heating and cooling system installation, that license is what stands behind the work itself. On top of it, most cities and counties in Mississippi require a permit from the local building office for this kind of job, along with an inspection once the installation is finished. That inspection checks the work on site, separate from the license that let the contractor take the job in the first place.
Source: Mississippi State Board of Contractors
- When should I replace my HVAC system?
- Replace it when repairs start piling up or when the system can no longer keep the house comfortable through both the summer heat and the winter cold. An old furnace or air conditioner tends to break down more often as it ages, and each repair is money spent on equipment that is still winding down. If your system is old and just had a major part fail, that's usually the point where a new install makes more sense than another repair. A contractor who inspects it can tell you what shape it's really in.
- Should I replace my furnace and air conditioner at the same time?
- If both are old, yes, it's worth doing together. A furnace and air conditioner installed at the same time are matched to work as one system, which matters since homes here run the heat from November through March and the air conditioner from May through September, ten months of the year combined. If only one has failed and the other is still fairly new, a contractor can tell you whether it makes sense to wait or replace both now.
- What happens during an HVAC installation?
- A contractor removes the old furnace and air conditioner, or heat pump, and sets the new equipment in place, connecting it to the ductwork, the gas or electric line, the refrigerant lines, and the thermostat. Once it's running, they check the airflow, the refrigerant charge, and the temperature it's putting out to make sure the system is working the way it should. Mississippi requires HVAC contractors to hold a state license for this work, and most cities and counties require a permit and an inspection once the job is done. Ask the contractor how they're handling the permit before the work starts.