Heating and Air Conditioning Repair | Ressler & Mateer
24 Hour Service
24 Hour Service - 7 days a week     CALL (717) 859-2025

Complete Residential & Commercial HVAC Service & Installation

Available in Harrisburg, Lancaster, Lebanon, Reading, West Chester and York, PA

Ressler and Mateer is proud to be considered the premier provider of heating and cooling services in the region. We deliver an unparalleled level of service and support, guided by the values that founded this company - commitment, dedication to service, and quality products.

Interested in a New Heating System?

24 Hour HVAC Services

Replacing Your System

When the time comes to replace your HVAC system, you can count on Ressler and Mateer. We'll help you select the optimal system for your space and budget - then we'll install it and maintain it, year after year.

Ressler and Mateer also specializes in ductless heating and cooling systems throughout Lancaster, PA. We will work with you to find the best ductless heating and cooling systems option - and even install and maintain it, leaving you worry-free!

Our Guarantee!

The foundation of our business is, and always has been, quality customer service. We don't just stand by our work - we stand with our clients. This is why, on top of any manufacturer warranties, we guarantee all our workmanship and labor for one full year.

Service and Maintenance

Whenever we show up for a job, we guarantee your satisfaction. With 24/7 emergency service and maintenance programs to keep your systems running smoothly, we're always there for you, no matter the issue.

HVAC Service & Repair

Heating Repair


Your comfort is our priority. Ressler and Mateer offers top-quality products backed by outstanding service to keep you comfortable, however low the temperatures may dip. We work with the best companies in the industry - here's a look at our partners.

Air Conditioning Reapir

Air Conditioning

Our company has extensive capabilities in both commercial and residential air conditioning. We provide innovative systems with a reputation for dependability and superior service life.



An advanced geothermal heat pump system harnesses the energy generated and stored inside the earth. Geothermal is a sustainable, efficient, eco-friendly choice for heating and cooling for your facility.

Reapir Technicians

Our HVAC technicians are happy to serve homes and businesses in Harrisburg, Lancaster, Lebanon, Reading, West Chester, and York, PA.

Since 1970, we've serviced thousands of homes and businesses, offering everything from emergency repair service to large-scale, ongoing maintenance plans. Whether it's the first time you've seen us, or whether you're used to seeing us every year, you'll be impressed by the same professional courtesy families have known us for over the past 45 years.

Emergency Service

Emergencies - 24 Hours, 7 Days a Week.

Many heating, cooling, and plumbing problems are emergencies. When your next emergency happens, let one of our licensed and insured service technicians come to your rescue.

When you're ready for an upgrade, call Ressler & Mateer!

We provide installation for new heating and cooling systems and retrofit options to keep you comfortable year-round.

Better Business Bureau
North American Technician Excellence
Carrier Authorized Dealer