AC Installation in Slidell, LA Sized for Your House, Not the Old Unit
Most replacements copy the size of the old system. We measure the house first, then install equipment that fits it. You get the price in writing before we start.
- Licensed and insured
- EPA 608 certified
- All major brands
- Written price first
Bigger is not better in a humid climate
An air conditioner has two jobs in Slidell. It cools the air, and it pulls water out of it. A system that is too big cools the house fast and shuts off before it removes much moisture. The thermostat reads 74°F, but the house feels damp.
Many homes here had the old unit’s size copied onto the new one. If the house has since gained new windows, attic insulation or a closed-in porch, that number is now wrong. Some systems were oversized from the start.
So we run a Manual J load calculation before quoting. It accounts for square footage, insulation, window area, ceiling height and which way the house faces. The result gives us the right tonnage instead of a guess.
What a new system costs in Slidell
Most residential replacements in our area fall between $3,000 and $8,000. These are the factors that move the price.
| Factor | Lower end | Higher end |
|---|---|---|
| System size | 2 to 2.5 tons for smaller homes | 4 to 5 tons, or two systems |
| Efficiency | Federal minimum, 14.3 SEER2 | Two-stage or variable-speed equipment |
| Equipment type | AC paired with an existing furnace | Full heat pump system with a new air handler |
| Ductwork | Existing ducts sealed and reused | Ducts resized or replaced |
| Access | Ground-level unit and an easy attic | Raised platform, tight attic or long line set |
Financing is available. The federal 25C tax credit ended for AC and heat pump systems installed after December 31, 2025. Older articles that still list it are out of date.
Which system fits your home
Central AC with a furnace
The right choice when the house already has a working furnace and sound ducts. We replace the outdoor unit and the matching indoor coil together so they work as a pair.
Heat pump system
Cools in summer and heats in winter with one outdoor unit. Many Slidell homes already run one, and our heat pump page covers them in detail.
Ductless mini-split
For additions, garages and older homes without room for ducts. Our mini-split page explains how the indoor heads work.
Single-stage or variable-speed
Single-stage units run at full power or not at all. Variable-speed units slow down and run longer, which removes more humidity. The extra cost pays back faster in homes that cool most of the year.
What happens on installation day
Protect the house
We lay down floor covers and set up a clear path to the attic or closet.
Recover and remove
We recover the old refrigerant as EPA rules require and haul the old equipment away.
Set the new equipment
The outdoor unit goes on a level pad or raised stand, matched to the new indoor coil or air handler.
Vacuum and charge
We pull a deep vacuum on the lines, then charge the system by measurement.
Test and walk through
We check airflow, temperature split and the drain, then show you the thermostat and filter.
Four things to know about new systems in 2026
New systems use new refrigerants
Most new equipment now ships with R-454B or R-32 instead of R-410A. These refrigerants need different tools and handling, and our technicians are trained on them.
Louisiana’s minimum is 14.3 SEER2
Louisiana sits in the federal Southeast region. A new split AC under about 3.75 tons must rate at least 14.3 SEER2. Anything sold to you as new should meet it.
Replace the indoor coil too
Pairing a new outdoor unit with an old indoor coil lowers efficiency and can affect the warranty. We quote matched systems by default.
Register the equipment on time
Most brands extend parts coverage to 10 years when the system is registered soon after installation. We give you the model and serial details you need to do it.
Before and after a new system
AC installation questions
How much does a new AC cost in Slidell?
Most residential replacements run $3,000 to $8,000. Size, efficiency, equipment type and duct work decide where your job lands. The free in-home estimate gives you a fixed written price.
How long does installation take?
Most replacements take one day. Jobs with duct changes, a new air handler location or a raised platform can take two. We tell you the timeline before we start.
What size AC do I need?
It depends on the house, not just the square footage. We run a Manual J load calculation that accounts for insulation, windows, ceiling height and orientation. Copying the old unit’s size is how many homes end up oversized.
Can I keep my existing ductwork?
Often, yes. We inspect the ducts during the estimate. If they are sized right and only leaking, we seal them. If they are crushed or too small, we tell you before you buy.
Do you pull permits for AC installation?
Yes. Every replacement is permitted through the City of Slidell or St. Tammany Parish, depending on your address, and inspected after installation.
Is there still a federal tax credit for a new AC?
No. The 25C credit ended for equipment installed after December 31, 2025. Ask your power company about any current rebates, and ask us about financing.
How soon can you install if my old system died?
For homes with no cooling, we offer same-day or next-day installs when the equipment is in stock. Homes with elderly residents or infants get the earliest slots.
Get a written quote for a new system
Call between 7am and 9pm, any day of the week, to book a free in-home estimate. We measure the house, check the ducts and put every option in writing.
We install new systems across the region, including AC installation for Covington homes, Mandeville, Metairie and New Orleans. Repair still the better call? See AC repair in Slidell.