If you’re considering replacing your air conditioner, furnace, or water heater, you probably want to know one thing before scheduling an appointment: How much is this going to cost?
A+ Derr created this pricing guide to give homeowners a realistic starting point. You’ll find starting installation prices, monthly payment examples, and Good, Better, and Best equipment options for air conditioners, furnaces, and water heaters.
Every home is different, so your final price can vary based on equipment size, efficiency, installation requirements, existing infrastructure, accessibility, code requirements, and other factors.
Our goal is to give you enough information to understand your options before we ever step through your door.
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.
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 $77.85/month (Good)
A straightforward, single-stage air conditioner designed to provide dependable cooling at an affordable starting price. The ML13KC1 offers efficiency of up to 13.4 SEER2 and uses R-454B refrigerant.
- Lennox EL16KCV – Starting at $97.64/month (Better)
A variable-capacity air conditioner designed to provide more precise cooling and improved temperature and humidity control. The EL18KCV offers efficiency of up to 19.5 SEER2 and quieter operation than the entry-level option.
- Lennox SL25KCB – Starting at $142.50 /month (Best)
A premium Lennox air conditioner designed for homeowners who want advanced comfort, efficiency, and variable-capacity performance.
What Factors Influence the Cost of an Air Conditioner Installation?
- 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
Take advantage of our flexible financing options available for your furnace replacement:
- Lennox ML180UH – As low as $71.25/month
A dependable, single-stage gas furnace designed to provide reliable heating at an affordable starting price. The ML180UH070E36BK is an 80% AFUE furnace with a constant-torque blower motor.
- Lennox EL297UH – As low as $79.17/month
A high-efficiency, two-stage gas furnace with a variable-speed blower designed to provide more consistent comfort and quieter operation. The EL297UH offers up to 97% AFUE efficiency.
- Lennox SLP99DF – As low as $98.96/month
A premium variable-capacity furnace designed to provide precise, consistent heating while maximizing efficiency. The SLP99DF070XV36BK offers 97.5% AFUE efficiency and a variable-speed blower.
The pricing shown represents a typical furnace replacement. Your final price may vary based on your home’s specific needs.
What Factors Influence the Cost of a Furnace Installation?
- 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
- 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.
A+ Derr 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 $29.04/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 $35.65/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 $59.37/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.
What Factors Influence the Cost of a Water Heater Installation?
- 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
We’ll review any required changes and pricing with you before work begins; no surprise charges.
How to Get an Exact Price for Your HVAC Replacement?
Ready to Move From an Estimate to an Exact Price?
Online pricing is a helpful starting point, but every home is different.
The final price of a new air conditioner, furnace, or water heater depends on factors such as equipment size, efficiency, existing ductwork and plumbing, electrical and gas requirements, venting, accessibility, and local code requirements.
An A+ Derr Comfort Advisor can evaluate your home, walk you through your Good, Better, and Best options, and provide a clear price before any work begins.
No pressure. No guesswork. Just clear options and straightforward pricing.
Ready to find out what your replacement would cost? Call A+ Derr or schedule your free estimate today.
All prices shown on this page are starting prices for informational purposes only and do not constitute an offer. Monthly payment examples are based on 10-year financing at 9.99% APR and are subject to credit approval and applicable financing terms. Actual pricing and payment amounts may vary based on equipment, installation requirements, financing terms, and other factors.
Page Updated on Oct 2, 2026
