Wondering what a new air conditioner, furnace, or water heater will actually cost for your home in Greater St. Louis, St. Charles, or Southwest Illinois before you invite a technician over? We believe in upfront transparency.
Classic Aire Care put together this comprehensive HVAC Pricing Guide to help you understand what to expect before scheduling an in-home estimate. Inside, you’ll find transparent starting installation prices, monthly financing examples, and a clear comparison of features across our Good, Better, and Best equipment tiers.
Keep in mind that every home is unique. Your final estimate can vary based on equipment size and efficiency ratings, existing ductwork or venting, electrical or gas upgrades, system accessibility, local building codes, and other installation requirements.
To provide complete clarity, we outline the most common factors that influence pricing, so you understand where your investment goes. Use this guide to compare your options, then contact our team to discuss the ideal comfort solution for your home.
AC Installation Costs & Pricing Guide: Good, Better, Best Options*
Replacing your air conditioner doesn’t have to mean choosing between a basic system and the most expensive option available. We offer Good, Better, and Best options so you can choose the combination of comfort, efficiency, and features that makes sense for your home.Â
AC Installation Pricing
How Much is an Air Conditioner Per Month? Financing Options Available
Explore our convenient financing options available to help make your new air conditioner installation budget-friendly:
- Lennox ML13KC1 – Starting at $90 per month (Good)
A straightforward, single-stage air conditioner designed to provide dependable cooling at an affordable starting price of $6,500.
- Lennox EL16KC1 – Starting at $117 per month (Better)
A mid-tier variable-capacity air conditioner designed to provide more precise cooling and improved temperature and humidity control, starting at $7,500.
- Lennox SL25XPV – Starting at $218 per month (Best)
A premium Lennox air conditioner designed for homeowners who want advanced comfort, efficiency, and top-tier variable-capacity performance, starting at $10,000.
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.
How Much Does a Furnace Cost? Installation Pricing Guide*
A new furnace is about more than just how much heat it can produce. The equipment you choose can affect efficiency, noise, airflow, temperature consistency, and overall comfort.
Our Good, Better, and Best options give you a range of choices—from a dependable single-stage furnace to advanced variable-capacity technology.
Furnace Installation Pricing
Furnace Financing Options Available: Monthly Payment Breakdown
Explore our convenient financing options available to help make your new furnace installation budget-friendly:
- Lennox ML180 – Starting at $5,500 (As low as $72 per Month)
A dependable, single-stage heating solution designed to deliver reliable comfort and efficient warmth at an accessible entry-level price point.
- Lennox SL280V – Starting at $6,500 (As low as $85 per Month)
Our most popular mid-tier furnace option, engineered to provide balanced temperature control and reliable performance for your home.
- Lennox SLP99 – Starting at $9,000 (As low as $118 per Month)
A premium high-efficiency heating system designed for homeowners seeking maximum comfort, advanced staging, and long-term energy savings.
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 Costs & Pricing Guide*
Choosing a new water heater isn’t just about the purchase price. The right option depends on your home’s hot water needs, available space, venting, and how you want your system to operate.
Classic Aire Care offers traditional tank-style water heaters as well as high-efficiency tankless options, giving you choices at different price points.
Water Heater Installation Pricing
Water Heater Financing Options Available: Monthly Payments
Utilize our convenient financing options available to fit your new water heater into your monthly budget:
State SG5640BCSKN90N – As low as $33/per month
A traditional tank-style gas water heater designed to provide dependable hot water for your home at an affordable starting price.
- State SGS650BRTK90 – As low as $39/month
An upgraded State gas water heater offering additional performance and features over the entry-level option while maintaining the familiar tank-style design.
- Navien NPE-180A – As low as $105/month
A high-efficiency tankless water heater that heats water on demand rather than storing it in a tank. The NPE-180A offers up to 0.95 UEF efficiency and can deliver continuous hot water while taking up significantly less space than a traditional tank-style water heater.
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
