HVAC Services in Harleysville, PA

Family-Owned, Community-Rooted HVAC Service Since 1986

Carl j Wendler heating and cooling was founded in 1986 by Carl Wendler, a Southeastern Pennsylvania local who grew up, went to school, and started his family in the same community he now serves. After years of working for larger companies, Carl launched this business with one clear goal: give back to the neighborhood that shaped him. 

Nearly four decades later, we’ve built a reputation as one of the most honest HVAC companies in Harleysville and the surrounding areas. Our NATE-certified technicians are fully trained, licensed, bonded, and insured, covering residential and commercial work across heating, cooling, heat pumps, boilers, furnaces, mini-splits, and indoor air quality systems. One call gets you a free estimate with no hidden fees and no obligation attached.

Complete Residential & Commercial HVAC Solutions

Air Conditioning Services

When Harleysville summers turn up the heat, you need an air conditioning system that’s up to the challenge. We handle the full AC lifecycle: routine maintenance, repair, emergency response, and new installation or replacement. Whether you’re running a central air system, a ductless mini-split, or a heat pump, our team knows these systems inside and out.

Mitsubishi Electric Mini-Split Systems

We install, maintain, and repair Mitsubishi Electric ductless mini-split systems as a dedicated service offering. Mitsubishi Electric technologies are particularly well suited to Harleysville homes that lack existing ductwork or need zone-specific climate control in additions, converted spaces, or multi-story layouts. Their advanced zone control and built-in filtration make them a smart fit for both comfort and indoor air quality.

Heating Services 

When winter arrives in Harleysville, you need a heating system that’s ready to answer. Our heating professionals work on all types of furnaces, boilers, heat pumps, and radiant heating systems. We’ll keep your existing system running with regular tune-ups or respond quickly to unexpected repairs. We offer 24/7 emergency HVAC services, and customers have reached us and been scheduled even during high-demand periods like snowstorms.

Indoor Air Quality Services 

The air inside your home can hide dust, pollen, pet dander, and volatile organic compounds (VOCs) from everyday items. Our air quality technicians use state-of-the-art testing equipment to identify what shouldn’t be floating around in your air, evaluate humidity levels, and then work with you to build a personalized IAQ plan for your home. We keep you updated throughout the process, from the first assessment through final recommendations.

Our air purification and filtration services go beyond simply swapping a filter, though that matters too. We offer advanced air cleaning solutions that reduce allergens and support cleaner breathing throughout your home. Choose HEPA filters that capture the smallest airborne particles, UV light purification systems that neutralize bacteria and viruses, electrostatic filters, or whole-home dehumidifiers. We have the tools to make a real difference in your indoor environment.

Trust Our Family of Pros for HVAC Services in Harleysville

We’re ready to handle all your heating and cooling needs for residential and commercial properties throughout Harleysville and Montgomery County. We offer flexible financing with approval in about 90 seconds, so you can get the system you need without straining your budget. Our standard is simple: the job isn’t done until you’re happy.