If you are considering replacing your air conditioner, furnace, or water heater in Greater St. Louis, St. Charles, or Southwest Illinois, you may be concerned about costs. Classic Aire Care created this HVAC Pricing Guide to help homeowners understand what to expect before scheduling an in-home estimate. This guide provides starting installation prices, monthly payment examples for various air conditioners, furnaces, and water heaters, and a comparison of features for our Good, Better, and Best equipment options.
Each home in Greater St. Louis, St. Charles, and Southwest Illinois is different, so HVAC or water heater installation costs can vary based on equipment size and efficiency, ductwork, venting, electrical or gas upgrades, system accessibility, code requirements, and other factors. To provide transparency, Classic Aire Care outlines the most common factors that influence pricing, so you understand where your investment goes. Use this guide to compare AC replacement costs, then contact our team to discuss the best equipment and installation options for your home.
AC Installation Pricing Guide*
A new central air conditioner installation starts at $6,500 for a Lennox ML13KC1, $7,500 for a Lennox EL16KC1, and $10,000 for a Lennox SL25XPV.
AC Installation Pricing
Air Conditioner Installation Cost per Month
- Lennox ML13KC1 Air Conditioner – Starting at $90 per Month
- Lennox EL16KC1 Air Conditioner – Starting at $117 per Month
- Lennox SL25XPV Air Conditioner – Starting at $218 per Month
The pricing shown represents a typical air conditioning replacement. Your final price may vary based on your home’s specific needs.
Reasons for AC Cost Increases
- System size and capacity required to properly cool your home
- Efficiency level and equipment selected
- Electrical upgrades needed to meet current code requirements
- Ductwork modifications, repairs, or transitions
- Refrigerant line-set replacement or modifications
- Drainage or condensate modifications
- Equipment location or accessibility, including attic, crawlspace, or rooftop installations
- Permit, inspection, or code-required upgrades
- Other installation conditions identified during an in-home evaluation
We’ll review any required changes and pricing with you before work begins; no surprise charges.
Furnace Installation Pricing Guide*
Wondering about the monthly cost of a new furnace? We want you to see real prices before you book an appointment. Our furnaces start at $97 per month for the Lennox, and $147 per month for the Lennox. All of these options offer high-efficiency Lennox heating. You can also choose upgrades for more consistent temperatures, quieter operation, better humidity control, and advanced system technology. Your actual price will depend on the size of furnace your home needs and how complex the installation is.
Furnace Installation Pricing
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Furnace Installation Cost per Month
- Lennox ML196UH070XE36BK – Starting at $98 per Month
- Lennox EL297UH070XV36BK – Starting at $101 per Month
- Lennox SLP99UH070XV36BK – Starting at $130 per Month
The pricing shown represents a typical air conditioning replacement. Your final price may vary based on your home’s specific needs.
Reasons for Furnace Cost Increases
- Furnace size and heating capacity required for your home
- Efficiency level and equipment selected
- Gas piping modifications or upgrades
- Electrical upgrades needed to meet current code requirements
- Venting, flue, or combustion-air modifications
- Ductwork modifications, repairs, or transitions
- Condensate drainage requirements for high-efficiency equipment
- Equipment location or accessibility, including attic or crawlspace installations
- Permit, inspection, or code-required upgrades
- Other installation conditions identified during an in-home evaluation
We’ll review any required changes and pricing with you before work begins; no surprise charges.
Water Heater Installation Pricing Guide*
Choosing a new water heater comes down to more than just the purchase price. It also means deciding which type of system best fits your home, hot water needs, and installation. Our water heater options start at $2,000 for a Bradford atmospheric-vent gas water heater, a traditional tank-style system featuring the ICON System®, Defender Safety System®, Hydrojet® sediment-reduction technology, and Vitraglas® tank lining.
For homes that require greater venting flexibility, our power-vent option starts at $3,000 and uses a powered blower that allows exhaust to be vented horizontally or vertically through a wall or roof. For homeowners looking for premium efficiency and tankless performance, the Navien NPE-240A2 starts at $8,000 and combines a 0.95 UEF rating with dual stainless steel heat exchangers, built-in ComfortFlow® recirculation, and continuous hot-water delivery of up to 11.2 GPM depending on temperature rise.
The final installed price can vary based on venting, gas-line, electrical, plumbing, and other installation requirements.
Water Heater Installation Pricing
Water Heater Installation Cost per Month
- Bradford White RG240T6N Atmospheric Vent Gas Water Heater – Starting at $26 per Month
- Bradford White RG1PV40S6N Power Vent Gas Water Heater – Starting at $39 per Month
- Navien NPE24A2 High Efficiency Condensing Tankless Water Heater – Starting at $105 per Month
The pricing shown represents a typical water heater replacement. Your final price may vary based on your home’s specific needs.
Reasons for Water Heater Cost Increases
- Tank size, capacity, and equipment selected
- Gas or electrical upgrades required for the new water heater
- Gas piping modifications
- Water supply or plumbing modifications
- Venting or combustion-air modifications
- Expansion tank or pressure-control requirements
- Drain pan, drain line, or other water-protection requirements
- Code-required safety upgrades
- Equipment location or accessibility
- Permit and inspection requirements
- Conversion to a different type of water heater, such as tankless, power-vented, or electric
- Other installation conditions identified during an in-home evaluation
Ready to Move From Estimated Pricing to a Real Quote?
Online pricing is a helpful starting point, but the most accurate way to determine the cost of a new air conditioner, furnace, or water heater is to have your home evaluated by an experienced professional. Every installation has unique variables—such as system capacity, efficiency ratings, ductwork configuration, venting, gas lines, electrical demands, and municipal code requirements—that influence your final investment. Classic Aire Care will carefully assess these conditions with you, walk you through your options, and present transparent pricing before any work begins.
For Greater St. Louis, St. Charles, and Southwest Illinois homeowners, Classic Aire Care provides free replacement estimates, flexible financing options, drug-tested and background-checked technicians, a 100% satisfaction guarantee, and reliable service when you need help quickly. Our goal is to make replacing an HVAC system or water heater straightforward and stress-free from start to finish.
Ready to move from estimated pricing to a real number? Contact Classic Aire Care today to schedule your in-home estimate. We will help you compare Good, Better, and Best options, answer your questions, and provide the clarity you need to choose the right system for your Greater St. Louis, St. Charles, or Southwest Illinois home.
Call  (314) 200-1211 or request service online today.
We’ll review any required changes and pricing with you before work begins; no surprise charges.
* All prices on this page are for informational purposes only. The listed prices do not constitute an offer
