Understand Your Estimated Monthly Costs

If you are considering replacing your air conditioner, furnace, or water heater across Southeastern Wisconsin, navigating replacement costs doesn’t have to be stressful. Serving local homeowners since 1929, Thielmann Heating, Cooling & Plumbing created this pricing guide to help you understand what to expect before scheduling an in-home estimate. This guide provides estimated monthly costs and a comparison of our Good, Better, and Best equipment options.
Monthly amounts are illustrative estimates for comparison. Contact Thielmann to confirm available payment options, terms, and your personalized quote.
Each home is different—from historic properties to modern builds—so installation costs can vary based on equipment size, efficiency, ductwork, venting, electrical or gas upgrades, and code requirements. To provide complete transparency, Thielmann outlines the most common factors that influence pricing so you understand where your investment goes.
Use this guide to compare estimated monthly costs, then contact our team to discuss the best comfort solutions for your home.
Air Conditioning Monthly Estimates
Variable-Speed Premium AC
Standard Efficiency AC
Performance AC
The monthly estimates shown represent a typical air conditioning replacement. Your actual monthly cost may vary based on your home’s specific needs.
What Can Affect Your Monthly AC Estimate
- 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
Furnace Monthly Pricing Guide

Wondering about the monthly cost of a new furnace? We want you to see clear pricing before you book an appointment. When winter weather across Southeastern Wisconsin gets severe, having a reliable heating system matters. Our furnace options have estimated monthly costs of $54.17 for our Good tier, $62.50 for the Better tier, and $83.33 for the Best premium option. You can also choose upgrades for more consistent temperatures, quieter operation, better humidity control, and advanced system technology. Your actual monthly cost will depend on the size of furnace your home needs and how complex the installation is.
Furnace Monthly Estimates
Modulating Premium Gas Furnace
Standard Gas Furnace
Two-Stage High-Efficiency Furnace
The monthly estimates shown represent a typical furnace replacement. Your actual monthly cost may vary based on your home’s specific needs.
What Can Affect Your Monthly Furnace Estimate
- 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
Water Heater Monthly Pricing Guide

Choosing a new water heater means deciding which type of system best fits your home, hot water demands, and regional water conditions. Thielmann’s traditional atmospheric-vent gas water heater features advanced sediment-reduction and protective glass tank lining, with an estimated monthly cost of $16.67.
For homes that require greater venting flexibility, our power-vent option has an estimated monthly cost of $25.00 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 endless performance, our high-efficiency tankless water heater option has an estimated monthly cost of $66.67, delivering continuous hot water on demand.
Water Heater Monthly Estimates
High Efficiency Tankless Water Heater
Good
Atmospheric Vent Gas Water Heater
Power Vent Gas Water Heater
The monthly estimates shown represent a typical water heater replacement. Your actual monthly cost may vary based on your home’s specific needs.
What Can Affect Your Monthly Water Heater Estimate
- 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 pipe, 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 Get a Monthly Estimate for Your Home?
Monthly estimates are a helpful starting point, but the best way to understand the monthly cost of a new air conditioner, furnace, or water heater is to have your system properly evaluated. Equipment size, efficiency, ductwork, venting, plumbing, electrical requirements, accessibility, and local code requirements can all affect the final monthly estimate. Thielmann will review those factors with you, explain your options, and provide transparent pricing before work begins.