HVAC Installation in Slidell, LA
A new system here will heat from November through March and cool from April through October every year. Tell us about the house, and a licensed contractor who covers St. Tammany Parish will get in touch.
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Slidell runs both systems almost year round
Homes here need heat from November through March and cooling from April through October. That is 12 months of the year with one or the other running, and only a short stretch when neither is. Winter nights average 43°F, so the furnace side isn't working against deep cold, but summer afternoons average 91°F, and that heat holds on for seven months straight.
A new system here has to handle that long cooling stretch without a break, then switch over and cover a mild but real winter. Most homes in the parish heat with electricity, and after a storm knocks out power, that matters. Southeast Louisiana saw 88 damaging wind events over the last ten years, and statewide, close to half of households lost power for at least a day in 2024. Whatever gets installed should be sized and set up to come back on by itself once the power does.
- 5 months
- November through March, your system heats
- 7 months
- April through October, it cools
- 43°F
- the average winter night it heats against
- 91°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
Louisiana requires HVAC contractors to hold a state license.
The Louisiana State Licensing Board for Contractors tests the contractor and keeps them on record. That license covers the business, not each job, so the same license applies to every installation this contractor takes on.
For a new heating and cooling system, the license tells you this contractor was tested and is on file with the state. Most cities and counties also require a permit for this kind of installation, with an inspection once the work is done. That inspection is what checks the install itself, the wiring, the refrigerant lines, the flue if there is one. The license and the permit answer different questions, and both apply here.
Source: Louisiana State Licensing Board for Contractors
- When should I replace my HVAC system?
- Replace it when repairs start costing more than they're worth or when the system can no longer keep up on the hottest and coldest days. A system that's cycling more, running longer, or needing a service call every season is telling you something. Age matters too. Cooling runs April through October here and heat runs November through March, so a system in Slidell works nearly all year with little rest, and that shortens its life compared to a system that gets a real break. If your equipment is older and the repair bill is climbing, a contractor can look at the specific unit and tell you whether replacing it makes more sense than fixing it again.
- Should I replace my furnace and air conditioner at the same time?
- If both are near the end of their life, yes, it's worth doing together. A furnace and air conditioner installed at different times often don't match well, and mismatched equipment can run less efficiently or wear out sooner. They also share parts of the same system, like the ductwork and the coil, so replacing one while leaving the other in place can limit how well the new unit performs. If only one is failing and the other still has good years left, 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, air conditioner, or heat pump and sets the new equipment in place, then connects it to the ductwork, electrical, refrigerant lines, and in some cases gas or condensate lines. Once everything is connected, the system gets tested to make sure it's heating and cooling correctly and holding the right refrigerant charge. In most cities and counties, this job needs a permit from the local building office, and the finished work gets inspected before it's signed off. Louisiana also requires the contractor doing the work to hold a state license, so it's worth confirming that before the job starts.