Furnace Installation in O'Fallon, MO
New Gas Furnaces Sized, Matched and Vented for Your Home
At On Time Experts Heating, Air & Plumbing, furnace installation means replacing an aging furnace with a new one sized to your home, matched to your air conditioner and vented correctly. You get honest repair-or-replace advice and upfront pricing before any work begins.
What Furnace Installation Services Do We Provide?
Furnace installation is the removal of your old furnace and the sizing, installation and startup of a new one matched to your home and your air conditioner. Around O'Fallon, that usually means a gas furnace in the basement, sharing ductwork and an indoor coil with a central air conditioner.
You may need a new furnace when repairs are getting frequent, heating bills keep climbing or some rooms never get warm. Furnace replacement can also make sense when the air conditioner is due and you want the two matched.
Many gas furnaces last roughly 15 to 20 years with regular care, but age alone doesn't settle it. A cracked heat exchanger, the metal chamber that keeps combustion gases out of the air you breathe, usually means a new furnace. One failed ignitor doesn't, and On Time Experts Heating, Air & Plumbing will tell you when our Furnace Repair technicians are the better call.
What Is Included in Our Furnace Installation Services?
A furnace installation covers more than the furnace itself:
- Sizing and options: Size the furnace to your home and price options across efficiency levels and single-stage and two-stage models.
- Air conditioner matching: Match the furnace's blower and airflow to your air conditioner's indoor coil.
- Venting: Run PVC pipe for high-efficiency furnaces, or check the existing flue for standard models.
- Gas connection: Connect the gas line and leak-test it.
- Condensate drain: Connect the drain on high-efficiency furnaces, usually to a floor drain or condensate pump.
- Startup and cleanup: Run a full heating cycle, set up the thermostat, protect your floors and clean up.
Thinking about dual fuel? Our Heat Pump Installation and Repair page explains how a heat pump pairs with a gas furnace. Where a permit is required, the job is permitted.
Why Is Professional Furnace Installation Important?
A furnace runs for many winters, so the efficiency, venting and size you pick set your comfort and gas bills for years.
Choose the Right Efficiency
AFUE, or annual fuel utilization efficiency, is the share of the gas a furnace turns into heat for your home. An 80% AFUE furnace turns 80 cents of every gas dollar into heat, and a 95% model turns 95 cents. ENERGY STAR's furnace guide explains the ratings.
A single-stage furnace runs at full output every time. A two-stage furnace runs on low most of the time and steps up when it's coldest.
Vent It Correctly
High-efficiency furnaces vent differently. Their exhaust is cool enough to condense into water, so they vent through PVC pipe, often out a side wall, and need a condensate drain.
In older brick homes where the furnace and water heater share a chimney, that switch can leave the water heater venting alone, and the chimney may need a liner.
Size It to the House
An oversized furnace heats in short bursts, can wear out sooner and leaves rooms uneven, while an undersized one runs nonstop on single-digit nights. Correct sizing starts with a load calculation, such as ACCA Manual J, the industry sizing standard, which looks at insulation, windows, air leaks and layout.
Once it's in, dirt, dust and debris are the number one cause of air conditioning and heating system breakdowns, so a yearly Furnace Deep Clean and Tune-Up keeps a new furnace clean from its first fall.
What Happens During a Furnace Installation Visit?
A furnace installation runs like this:
- Look at your system. We check the furnace, coil, ductwork, gas line and venting.
- Review your options. We size the furnace and walk you through options, including repair, with upfront pricing.
- Choose and schedule. You pick the new furnace, and we handle permits and scheduling.
- Remove the old furnace. On installation day, we protect your floors, shut off gas and power, and take out the old unit.
- Set the new furnace. We connect gas, venting, drain, ductwork and thermostat, and leak-test the gas line.
- Test it. We run a full heating cycle and confirm airflow, temperatures and venting.
- Walk you through it. We show you the new system and clean up.
You'll know how to change the filter before we leave.
Frequently asked questions
Yes, you can add a heat pump during furnace installation to create a dual-fuel system. The heat pump handles cooling and most of the heating, and the new gas furnace takes over on the coldest nights.
The heat pump replaces the central air conditioner, so it makes the most sense when the air conditioner is also due. Ask for both setups priced side by side.
Most furnace installation jobs are finished in one day once the equipment is on site, and a straight swap in the same spot is quickest.
New PVC venting, a new air conditioner at the same time, or ductwork and gas line changes can add time, and permitting can affect the start date. You'll get a realistic schedule up front.
Furnace installation cost depends on the furnace's efficiency rating, its type and size, and what the job needs beyond the furnace itself. A high-efficiency furnace may need new PVC venting and a condensate drain, and gas line, ductwork or electrical changes add to the furnace replacement cost.
Utility rebates may offset part of it. On Time Experts Heating, Air & Plumbing gives upfront pricing for each option before any work begins.
Replacing the air conditioner during furnace installation makes sense when the air conditioner is aging, needs a major repair or runs on R-22, an older refrigerant that's no longer made. The furnace blower pushes air across the air conditioner's indoor coil, so installing both together lets them be matched for airflow and efficiency.
If your air conditioner is fairly new and working well, it can usually stay, and the new furnace is set up to match it.
The right efficiency for furnace installation depends on how long you plan to stay, your heating bills and your venting options. A 95% AFUE furnace turns more of each gas dollar into heat and often pays off over cold winters, but it needs PVC venting and a condensate drain.
An 80% furnace costs less up front and can often use the existing flue. Side-by-side pricing makes the choice clearer.
How Much Does Furnace Installation Cost?
Cost depends on the furnace you choose and what the job needs beyond it.
Factors that can affect the cost include:
- Efficiency and type: The AFUE rating and whether it's single-stage or two-stage.
- Venting changes: New PVC pipe or a chimney liner.
- Gas, electrical and drain work: Changes to the gas line, wiring or condensate drain.
- Ductwork and coil: Changes to match your air conditioner, or replacing it at the same time.
- Permits and rebates: Permit costs, and any utility rebates you qualify for.
You'll get upfront pricing for each option before any work begins. Ask about current Ameren Missouri or Spire rebates on qualifying high-efficiency equipment.
Why Choose On Time Experts Heating, Air & Plumbing for Furnace Installation?
We'd rather keep a furnace running than sell one before its time.
Clear recommendations: We'll say so when your furnace has years left.
Repair when repair is right: If one part has failed on a sound furnace, we'll price the repair next to the replacement.
Upfront pricing: Each option is priced before work starts.
Schedule Professional Furnace Installation
We install furnaces in O'Fallon, St. Peters, Brentwood and the communities around them.
We'll start by sizing your home and laying out your options, each with upfront pricing, and you decide when you're ready.