
Oshkosh HVAC Services
- Certified Bryant Dealer in Oshkosh
- 24-Hour Emergency HVAC Service
- Affordable Pricing & Financing Options
- Home & Commercial HVAC System Services
- NATE Certified HVAC Technicians
- Free HVAC Inspections
What You Should Look for in an HVAC Company in Oshkosh, WI

If you’re looking for a reputable HVAC contractor in Oshkosh, you’ve got options. But your HVAC system is a big investment, and you deserve a local, experienced team you can trust—not just the first name you come across.
A good HVAC company keeps your home comfortable, your system running safely, and your energy bills in check. A not-so-great one can cost you time, money, and stress. Here’s what to look for when choosing the right team for your home:
- Experience With Cold-Climate Systems
- Proper Licensing & Insurance
- 24/7 Emergency Service
- Reliable & Transparent Pricing
- Strong Local Reputation
- Expertise in Energy Efficiency
- Quality Installation & Maintenance Options
What Our Customers are Saying
Our Oshkosh HVAC Services

- Furnace Repair, Replacement, Sales & Installation
- Boiler Repair, Replacement, Sales & Installation
- Air Conditioning Repair, Replacement, Sales & Installation
- Air Purification & Humidification
- Duct Cleaning
- Sheet Metal and Ductwork Fabrication
- Commercial HVAC Repair, Replacement, Sales & Installation
Licensed and Insured Team
At Martens Heating, we’re fully licensed and insured, so you can feel confident inviting us into your Oshkosh home. We take pride in doing things the right way and understand Oshkosh building codes, permits, and safety requirements that protect your home or business.
If you hire someone without insurance and an accident happens, you could be financially responsible. A licensed HVAC contractor meets Wisconsin’s standards for safety and training. Insurance adds another layer of protection—just in case something unexpected happens.
Emergency Services
Heating goes out on the coldest January night? Your AC quits during a summer heat wave? These things happen, and usually at the worst possible time. When you have an HVAC emergency, Martens is there 24/7.
Our team is always on call for HVAC emergencies. We’ll show up quickly and do our best to get your system running again.
Common HVAC emergencies we respond to in Oshkosh include:
– Total system failure (no heating or cooling)
– Gas leaks or dangerous fumes/carbon monoxide
– Leaks or malfunctioning cooling system
– Frozen coils or iced-over outdoor units
– Poor airflow or improper heating or cooling during extreme weather
Experienced HVAC Contractors
Experience matters—especially when you’re dealing with your home’s comfort and safety. Martens Heating is a second-generation, family-owned business with more than 40 years of experience serving Oshkosh and the surrounding area. We’ve seen just about everything and know how to diagnose issues quickly, fix them the right way, and help you prevent future problems.
Financing Options
We believe every homeowner deserves reliable heating and cooling without breaking the bank. We’re known for our fair and transparent pricing. We also offer competitive HVAC financing options (with approved credit) to make larger repairs or unexpected replacements easier to manage.
Local Business
Unlike a lot of the HVAC chains or statewide companies, we’re a locally owned and operated HVAC company. Based in Omro, we’re committed to taking care of our neighbors and friends in the Fox Cities. We live here, work here, and understand the unique heating and cooling needs of Wisconsin homes. Offering dependable HVAC service and repair is our way of giving back to the community that’s supported us for generations.

Need HVAC Repairs or Installation in Oshkosh?
Calling all Oshkosh homeowners! Whether your furnace needs a tune-up, your AC is acting up, or it’s time for a new system, we’re here to help. Reach out today for fast, friendly, reliable HVAC service—done by locals who treat you like a neighbor, not a number.
