Deiter Bros. has been serving local Lehigh Valley Homes and Businesses for over 80 years. Our goal has always been to exceed your expectations.

We have designed this site to provide you with a wealth of information on our many products and services. We are always researching the latest technology in indoor air quality and energy efficient systems. This one from Fan Handler is one of those "must have" comfort items!

We routinely service all heating and air conditioning systems. We recommend and install Lennox systems and our own
“Deiter Signature Series” systems.

Our heating oil is a special formulation we call EnviraFuel®. EnviraFuel® is a Cleaner, Greener Heating Oil that is blended with .

We offer a number of different payment and pricing plans to suit every budget.

While browsing our site, if you cannot find what you are looking for, just enter a keyword in our search bar on the right side near the top.

Need service on your heating or air conditioning system

Other great areas to browse:

• Ever wonder what inside your heating or cooling ducts?
• Planned Maintenance Agreements for all systems.
• You can pay your bills or view your account online
• View our list of frequently asked questions, (FAQ’S)
• Buying a home? Here are some great tips.

We also have a Security Division, 4 Seasons Security. We install and service most major brands of burglar, fire, CCTV and access control systems. We are a GE authorized dealer. GE has designated us a GE Security Pro Dealer. We provide monitoring 24/7 through our state of the art monitoring center staffed with highly trained security professionals.

Check our Reviews on Angie's List