"Calvert’s mission is to serve your family and make your home comfortable, while wowing you with the experience and earning your trust as a customer for life."

 (302) 998-0460

  • Breaking Bad Furnace Savings!

    Here are 3 ways for you to save right now:

    1. Until February 28th, get a no-obligation Energy Survey to seehow your system is performing. If it needs to be replaced, you’llget a 10% discount on all new equipment.
    2. Get a trade-in of up to $250 on your old furnace – whether it’sworking or not.
    3. Get 2 years of FREE maintenance on any new equipment we install.
    Read More
  • $29 Heat Pump Service Special!

    Did you know your Air Conditioning System reverses itself in the winter and pulls heat out of the outside air and puts the heat energy into your home, "Transforming" itself into a heating unit? Read More
  • $9 Diagnostic Fee and Safety Evaluation

    Included in the Diagnostic Fee:
    We will determine what is causing today's problem, then dig deeper and make sure no other problems are lurking around the corner.

    Included in the Safety Evaluation:
    We will visually inspect the furnace vent outside, and that there are no dangers associated with the natural gas or heating oil supply lines. We will also check the electrical power line and control wires for potential problems.

  • The Silver Club Membership

    Club members get our best pricing. Just one service call could easily save more than an entire years worth of membership dues.

    Only $14.95 a month!
    • • 50% off - evaluation fee
    • • Same/next day service
    • • 20% off repairs, annual maintenance
    • • Good for both furnace and AC
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  • Aeroseal Improves your HVAC Efficiency

    • Airtight savings: The money formerly leaking out of your ducts will stay in your pocket longer
    • Airtight comfort: Your hard to heat or cool rooms will have more even temperatures and be more comfortable
    • Improved air quality: You will see a reduction in dust and humidity, along with fumes and other odors
    • Reaches everywhere: Seals leaks nearly impossible to reach using other methods
    • Read More
  • Here when you need us

    We provide fast, same-day service from technicians that were personally trained by the owners. They are skilled, polite and clean-cut. They are the kind of guys you would be proud to call 'son'.

    What makes us different is we know that mistakes can happen. We are prepared to step up, take ownership, and make things right—right away. We promise, you won't go wrong by choosing Calvert.

    ~ Chris & Dave, Owners
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Our Services

We install / Replace:

  • ductless mini splits
  • heatpumps
  • geo-thermal
  • natural gas furnace
  • propane furnace
  • unit heaters
  • radiant floor systems
  • hydronic (boilers & radiators) systems
  • steam boilers
  • high velocity duct systems
  • central air conditioners
  • humidifiers and humidification systems
  • thermostats
  • zoning systems
Repairs on all brands:
Diamond 5 Star Dealer Geo-thermal Systems
Trane Comfort Specialists Trane Comfort Specialists
Trane comfort products Honeywell Humidifiers & Thermosats
Trane Comfort Specialists
York Certified Comfort Exert Arzel Zoning Products


Calvert Membership Club
Club members get our best pricing. Just one service call could easily save more than an entire years worth of membership dues. Learn more about our membership club here.

Call the company your neighbors trust

Diane P. -
Landenberg, PA

"Always so courteous and helpful! Very fair and honest."

Valerie S. -
Magnolia, DE

"Honest, punctual service with very knowledgeable associates."

Michael B. -
Newark, DE

"Returned my call promptly and was able to provide same-day service. "

Click to Read Testimonials from Your Neighborhood!

Geo-thermal heating


More than 50 percent of all heat pumps have problems with low airflow, leaky ducts, and incorrect refrigerant charge.

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Air Conditioning

Paying attention to your air conditioning system saves you money and reduces environmental pollution.

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Heating & Air Conditioning are things most people take for granted. We see it as our duty to ensure that they are working for you. Services FAQ »

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