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Fenton, MO · Air Conditioning

AC Installation in Fenton

You need a new air conditioner installed. You want a fair price and the best unit for your home. We can help.

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Newly installed outdoor air conditioning unit mounted on a house exterior

Need an AC installed? The right calculations are important. We assess your home to determine the right size for your home.

New air conditioning condenser installed by Patriot in Fenton, MO

Every AC installation starts with a free in-home estimate. A technician measures the house, checks the ductwork and electrical, and gives you a written price before anything is ordered.

When You Need AC Installation

When your old air conditioner needs a repair that is at least half the cost of a new unit, you'll save money in the long run on a replacement. As an experienced air conditioning contractor in Fenton, we will advise you that the following scenarios typically indicate an AC replacement is in your best interest.

  • Your current system age hits 10-15 years and repair bills keep climbing.
  • You experience the same mechanical breakdown twice in one cooling season.
  • Your electric bill goes up every month but you haven't changed the thermostat settings.
  • The rooms in your home stay warm regardless of thermostat settings.
  • Your air conditioner uses a phased-out refrigerant that costs top dollar to purchase.

Transparent Pricing And Financing Options

We price new units individually based on what we call cooling load calculations. This means we take into account various factors of your home to determine the exact size system your specific home needs to cool properly and remain efficient.

Why AC Unit Calculating Matters

This is important because a unit that is too large will waste energy and wear out the unit faster because it turns on and off quickly. Units that are too small will work overtime to keep your home cool. If your existing ductwork is too restrictive for the new unit, as can be the case in older homes, it can result in frequent breakdowns, such as frozen coils, and higher power bills.

Factors for New AC Calculations

  • Your home's square footage
  • Insulation quality
  • Ceiling height
  • Window layout
  • Existing ductwork location and leakage

Those measurements give us exact details to write up an itemized proposal covering the proper equipment, labor, wiring, line set parts, and permit fees. That itemized breakdown helps you see where every dollar goes before work begins. We offer flexible payment plans to break total project costs into manageable monthly amounts.

Energy Efficiency And System Options

Upgrading your equipment lowers your monthly electric bills while keeping your home comfortable. That new system meets updated SEER2 efficiency standards (opens in a new tab) designed for real summer operating conditions.

  1. Central Air Conditioning Systems. Our team installs these traditional systems to push chilled air through home ductwork and keep room temperatures consistent.
  2. Ductless Mini-Split Systems. Our techs set up these individual air handlers to cool specific spaces without using ductwork.
  3. Heat Pumps. We connect these dual-function units to handle heating and cooling while saving energy in mild weather.
  4. Packaged Systems. Our techs place these self-contained units in one cabinet outside to save indoor utility space.
  5. Smart and Zoned HVAC Systems. We pair digital controls with motorized dampers to manage temperatures in specific zones.

Why Expert AC Installation Makes All the Difference

Setting up new cooling equipment takes field experience instead of simple connection work. That technical setup process directly impacts equipment performance and monthly running costs.

  1. Proper Sizing. Our licensed techs calculate exact home cooling loads based on square footage and layout so your unit operates without wasting power. That detailed load calculation prevents your new unit from short cycling during summer heat waves.
  2. Correct Placement. We set outdoor gear in smart spots to cut running noise and keep air moving freely around the cabinet. That smart placement keeps equipment operating smoothly without disturbing your family inside.
  3. Precise Ductwork and Sealing. Our techs inspect and seal duct leaks during setup to deliver balanced airflow throughout your home. That sealed ductwork keeps cold air moving directly into living areas instead of leaking into crawlspaces.
  4. System Calibration. Our team adjusts thermostat wiring, safety switches, electrical components, and refrigerant charges before starting the equipment. That careful calibration makes sure everything runs safely right out of the box.
  5. Manufacturer Warranty Protection. Our professional installation meets factory standards so your manufacturer coverage stays valid. That factory warranty protection covers major parts if something goes wrong down the road.

Read more on balanced airflow and duct sealing (opens in a new tab). Need help with AC installation?

Step By Step Installation Process

Patriot technician connecting ductwork during an AC installation in Fenton, MO

Our process keeps your installation on track to reduce the stress you may feel about getting a new system installed.

  1. In Home Assessment. Our licensed techs inspect your home's ductwork, insulation ratings, window placement, and electrical panels.
  2. ACCA Manual J Load Calculation. Our team measures exact square footage to size equipment correctly.
  3. Written Proposals. We provide itemized choices showing efficiency tiers and price points.
  4. Permits. We file all the required permits with your local city or county, such as Fenton, St. Louis County or whatever municipality your property is located.
  5. Scheduling and Prep. Our team lays protective floor runners before moving heavy equipment inside.
  6. Old Unit Removal. We disconnect existing coils and condensers before hauling old equipment away.
  7. New System Setup and Testing. Our team sets new units, connects wiring, tests airflow, and handles permit sign-offs.

Standard replacements wrap up in one workday. Our techs walk you through thermostat controls and filter spots before leaving your home clean.

Why Homeowners Choose Us

  • Our techs train in our in-house training facility in Fenton under the mentorship of a 35 year industry veteran so your home isn't used as a training opportunity.
  • Every employee passes a background check and drug screening.
  • Every team member cares about your home and respects you.
  • We can typically get to your repair within 24 hours and offer weekend repairs.
  • You receive a free second opinion on installation quotes.

Licensing, Permits, and Verifying Your Contractor

Missouri lacks statewide HVAC licensing laws for technicians. That lack of state regulation means homeowners must make sure their AC contractor has proper credentials in their county and/or city. St. Louis County mandates mechanical permits for replacement cooling jobs. Patriot Heating, Cooling and Air Quality holds Journeyman license ML12523 and Mechanical license MSM02530 registered with county authorities.

  • Ask for contractor mechanical license numbers before signing contracts.
  • Confirm the permit gets pulled under the company name.
  • Request EPA Section 608 certification cards for installing technicians.
  • Call St. Louis County Public Works to check license status directly.

Official inspections confirm safety compliance on electrical connections and line sets. That final sign-off gives you total confidence in system safety.

Good to Know

Frequently Asked Questions

Common questions about AC installation

Most standard AC installations in Fenton take one full day. Our crew removes the old unit, sets the new condenser and coil, and finishes with startup testing before we leave. Older homes with mismatched ductwork or aging electrical panels can sometimes add extra time. We always confirm your schedule ahead of the visit, so you know exactly what day the work happens and what to expect when we finish.

You can expect a full crew that protects your flooring and landscaping before any work starts. We remove the old condenser and coil, install the new equipment to spec, and run a full diagnostic test before leaving. Before we go, we walk you through your thermostat and show you where the filter lives. We also handle permit sign-off, so that task never lands on your plate.

Sometimes, yes. Many older Fenton homes still have their original ductwork or an aging electrical panel that was never sized for newer equipment. Our in-home assessment catches these issues before installation day, not during it. Checking insulation, window exposure, and existing ductwork upfront prevents costly surprises later. This step matters most in neighborhoods with homes built decades ago, where systems have been patched over time.

We use an ACCA Manual J load calculation instead of guessing. It factors in your square footage, window exposure, and how your home is built. Sizing a unit too big or too small leads to short cycling, warm rooms, or high energy bills. This calculation is the same reason two Fenton homes of similar size can still need different equipment. Getting this step right protects your comfort for years.

The best time is before the first real heat wave hits, usually early spring. Waiting until your system fails during a hot stretch limits your equipment options and adds pressure to decide fast. Scheduling ahead lets us complete the in-home assessment and load calculation without rushing. It also gives you time to compare written equipment options at different efficiency levels before summer temperatures arrive.

What Our Customers Say

Real reviews from homeowners across Fenton and the St. Louis metro.

Ready for a free in-home estimate?

Patriot Heating, Cooling & Air Quality

  • 1750 Fenpark Dr #1100, Fenton, MO 63026
  • (314) 527-2722
  • Mon–Fri: 8:00am – 5:00pm
    Emergency service available
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