Serving St. Louis & Surrounding Areas
Stay Cool All Summer with New AC Installation in Oakville
Time to replace that 15-year-old AC that barely keeps up on hot days? We install new AC systems in Oakville and St Louis homes and businesses every single week. Liberty’s technicians know how to match the right size system to your space, install it properly, and get it running efficiently. No cutting corners, no rushed jobs. We do it right the first time. Free estimates on all new AC installation in Oakville.
Complete Air Conditioning Installation Solutions
Here’s what most people don’t know about installing a new AC: the size of the unit matters way more than the brand. We’ve seen brand-new expensive Carrier systems that can’t keep a house cool because someone guessed at the size instead of actually measuring what the house needs. An AC that’s too big turns on, cools the house down fast, then shuts off. Sounds good, right? Wrong. It never runs long enough to pull humidity out of the air, so your house feels sticky even when it’s cool. An AC that’s too small just runs all day trying to catch up and never quite gets there.
St. Louis summers are brutal. When it’s 95 degrees outside with crazy humidity for two weeks straight, your AC has to work harder than systems in other parts of the country. If it wasn’t installed right, problems show up fast. Maybe the guy who installed it didn’t add enough refrigerant. Maybe he didn’t seal the ductwork and all your cold air is leaking into the attic. Maybe he didn’t slope the drain line correctly and now water backs up inside your house.
We fix AC systems every week that are only a few years old but were installed wrong from the start. The equipment is fine. The installation was garbage. We actually measure your house to figure out what size system you need. We charge the refrigerant correctly. We test everything before we leave. Your new AC should work right from day one, not cause problems six months later. Understanding proper air conditioning installation standards helps ensure your system runs efficiently for years.
How We Size Your AC for an Oakville House
Sizing an AC is not a guessing game. There’s an actual industry calculation called Manual J. It accounts for square footage, ceiling height, window count and orientation, insulation in the walls and attic, where the house faces, how shaded the lot is, how many people live in the house. The result is a load number measured in BTUs. That number is what tells us whether you need a 2-ton, a 3-ton, or a 4-ton system.
Most contractors skip Manual J. They walk through the house, eyeball the size, and quote a system based on what’s already there or what fits the budget. Sometimes they get it right by accident. More often the unit is oversized because it’s safer to oversell than undersell from a customer-complaint standpoint. The customer never finds out until year three when the humidity in the house is unbearable and the energy bills are a hundred dollars higher than the neighbor’s.
An Oakville bungalow with original windows and limited attic insulation needs a different system than a 2010-built house with double-pane windows and a sealed attic, even if the square footage is identical. We do the load calc. We tell you what the math says. If it disagrees with what someone else quoted, we walk you through why so you can make the call yourself.
Our AC Installation Services
Emergency AC Installation St. Louis
Your AC died on Friday afternoon and every company you called can’t come out until Tuesday. We get it. That’s the worst. We actually keep units in stock specifically for emergencies like this. Most times we can get a new system installed same day or the next morning. You shouldn’t have to spend a whole weekend sweating in your house waiting for someone to show up. The equipment is on the truck, our crew is on call, and we run weekend emergency installs at no upcharge above the standard install price for the same unit.
Heat Pump Installation & Replacement
Heat pumps do both heating and cooling with one system. Instead of having a furnace for winter and an AC for summer, you get one unit that handles everything. They pull heat out of your house in summer and pull heat from outside air in winter. Sounds weird, but it works and saves money on utility bills. Modern cold-climate heat pumps work in St. Louis winters down well below freezing without needing a backup furnace, which is a real shift from the older units that fell apart at 30 degrees. Learn more about our professional heat pump installation services.
Emergency Heat Pump Installation & Replacement
Heat pump died and now you have no heating OR cooling? We stock heat pump systems so we can replace failed units fast. You’re not waiting a week for equipment to get ordered and shipped. We’ll get you back up and running quick. The math on emergency heat pump replacement is the same as standard install plus the cost of the after-hours call. We tell you the number up front so you can decide whether to wait until morning or get on the schedule that day.
Why AC Installation Quality Matters in St. Louis Summers
Most AC failures we get called for in July and August are not equipment failures. They are install failures showing up under load. The unit ran fine in spring when the outside temperature was in the seventies and the indoor target was easy to hit. Then July hits, the outside temperature climbs past ninety-five with eighty percent humidity, the unit has to actually work, and the install shortcuts surface.
The most common shortcut is undersized refrigerant lines. The line set between the outdoor condenser and the indoor coil has to be the right diameter for the system. Too narrow and the refrigerant cannot move fast enough to pull heat out of the air. The system runs constantly, the compressor works harder than it should, and the equipment ages two years for every one calendar year.
The second is uninsulated or undersized ductwork in the attic. St. Louis attics push a hundred and fifty degrees in the afternoon. Cold supply air flowing through that attic in uninsulated metal duct picks up heat at every joint. The air arriving at the registers in the rooms is already five to ten degrees warmer than it left the air handler. The system runs longer to compensate, the bill climbs, the rooms farthest from the air handler never quite cool down.
The third is poor condensate management. The drain line has to slope away from the indoor coil with no sags or kinks. When it does not, water backs up, the safety float trips, the system shuts down on the hottest day of the year. We see two of these calls a week in July. Every one was preventable at install time. We slope drain lines correctly and add a secondary float switch on every install so a clogged line shuts down the system before it floods a basement.
Frequently Asked Questions
How long does AC installation take in Oakville?
A standard residential AC replacement takes one full day, start to finish, when we’re swapping equipment in an existing setup with good ductwork. Add half a day if the line set needs replacement, the electrical needs upgrading, or the original install was unusual.
What size AC system do I need for my Oakville house?
The size depends on Manual J load calc inputs: square footage, insulation, window count, orientation, and shading. As a rough rule, a typical 1,800 square foot Oakville bungalow with average insulation lands at around 3 tons. We run the actual calc on every install so you’re not guessing.
Do I need a permit for AC installation in Oakville?
Yes. Mechanical permits for new AC equipment are required in Oakville and most of St. Louis County. We pull the permit, submit the equipment specs, and handle the inspection so the work is on the books and the warranty stays valid.
Should I repair my old AC or replace it?
If your unit is over 12 years old and the repair quote is more than half the cost of replacement, replace. If the unit uses R-22 refrigerant, replace because R-22 is phased out and refrigerant is now expensive to source. If neither applies and the repair fixes the actual root cause, repair makes sense.
What brand of AC do you install?
We install several major brands and pick the one that fits your house, your usage pattern, and your budget. Brand matters less than installation quality and correct sizing. The same brand installed wrong will fail before a less-known brand installed right.
Get Professional AC Installation in Oakville
Liberty Heating Cooling & Plumbing has been installing AC systems in St. Louis for 27 years. We’ve seen what happens when installations are done wrong. Systems that never cool properly, equipment that breaks down within a few years, homeowners stuck with expensive mistakes. Our techs actually measure your house to size equipment correctly instead of guessing. We install according to manufacturer specs, not shortcuts that save time but cause problems later. Everything gets tested before we leave.
Call (314) 600-2202 for AC installation throughout Oakville and St. Louis. We’re available 24/7 for emergencies and offer free estimates on new systems.