family owned and operated st. charles heating and cooling air conditioning service, repair, installation and replacement st. charles, missouri family owned and operated st. charles heating and cooling air conditioning service, repair, installation and replacement st. charles, missouri

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Our Heating & Cooling Services

HVAC Replacements and New Installation

We provide full and partial HVAC system repairs, replacements, as well as brand new ground-up installations of furnaces, air conditioner systems, heat pumps, and air quality systems.

Repairs and Parts

Our service organization offers unparalleled support in the industry. Though Hoff Heating and A/C is an independent Lennox dealer, we provide support for all makes and models. We pride ourselves on resolving customer issues on the first visit.

To learn more about the Service Department, click on the links below:


  • Hoff Heating and A/C technicians are qualified with a NATE certified ranking. NATE certification represents the industry standard of excellence.
  • Technician must meet monthly training requirements to maintain Journeyman Status
  • Our in-house training facility makes it easy for our technicians to learn! Whether it is our weekly service meeting, bringing in outside industry experts, or participating in online training programs...our technicians are equipped with the knowledge you would expect from your heating and cooling comfort advisor.
  • Certifications and training are part of our ongoing commitment to developing our employees. Recent training programs include: LP Gas, Trac Pipe, GeoThermal Systems, and Copeland Compressors.

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Service Department-24-Hour Emergency Service & More

With extended Service Appointments available Monday thru Saturday, most of our customers will never need an Emergency Repair. However, if Murphy's Law applies, we have technicians on call at all times to get your heating or cooling system up and running in the shortest time possible.

Our 24 Hour Emergency Hotline: 636-294-5000

Emergency repairs are just one of the features that Hoff Heating and A/C offers to keep our customers comfortable with minimal disruption to their busy lifestyles. Other highlights of our service department include:

  • Extended Office Hours from 7:30AM-5:00PM Monday thru Friday
  • Service Repair Appointments beginning at 7AM Monday thru Friday
  • Saturday Repair Service available from 7AM-12PM at regular rates
  • Courtesy Call offering when our technician is on the way to your home
  • Email scheduling capability for those who prefer this option

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5 Year Repair Guarantee

Enjoy 5 years peace of mind when a repair is made on your equipment! Equipment repairs, both parts and labor, will have a 5 Year Warranty with continued participation in our Planned Service Maintenance Program. Fix it once and fix it right!!

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Residential Agreements

We offer (2) basic maintenance agreements for our customers. Our Gold & Silver Plans offer different options to reflect the different needs of our customers.

Commercial Agreements

Our commercial agreements are customized for each individual location. Agreements offered range from monthly filter changes to quarterly and bi-annual agreements. We take care of your heating and a/c equipment at discounted rates on parts and labor so you can concentrate on your business. Contact us today for a customized maintenance quote!

  • What are the Benefits of a Maintenance Plan?
  • What are the Maintenance Plan Options?
  • What does a Maintenance Check Include?

Benefits of a Maintenance Plan:

  • Peace of Mind....We spot potential problems before they cause big trouble
  • Experts at Your Service....A competent, trained, dependable staff of experts will "worry" so you don't!
  • Price Protection....Your agreement price can not be raised during the effective dates
  • Lower Utility Costs....A study conducted by Louisiana State University proved that a service maintenance program saves a significant amount of money on monthly cooling. Heating systems will benefit as well.
  • Service You Can Trust....Rely on our skilled experts to give you fast, dependable and fair service.
  • Parts Discounts.... discounts on repair parts! (excluding the replacement of air conditioning and heating units, compressors, heat exchangers, and cooling or heat pump system coils that are out of warranty)
  • Priority Customer Service....Our maintenance customers enjoy the peace of mind that if emergency breakdowns they receive priority customer service.

Maintenance Plan Options:

Gold Plan

  • Includes 3 planned visits per year: Heating, Cooling, and a Midseason
  • Priority Customer Service for breakdowns
  • Includes a 15% Parts and Repair Discount
  • If you have a breakdown in between your planned visits, there would be NO service call charge (during regular business hours). If it is after normal business hours, you would only be charged a service call fee rather than overtime charges.
  • Our Midseason visit ensures that your filters are changed as needed and allows us to monitor the actual performance of your system during peak operation.

Silver Plan

  • Includes 2 planned service visits per year: Heating and Cooling
  • Priority Customer Service for breakdowns
  • Includes 10% Parts and Repair Discount
  • If you were to have a breakdown in between your planned visits, regular service call or overtime service call charges apply

Checkpoints of a Routine Maintenance Visit Include:


  • Test for Carbon Monoxide
  • Cycle unit at Thermostat
  • Furnace noise level normal
  • Check Furnace air filter
  • Inspect heat exchanger
  • Clean cells and cabinet
  • Clean burners
  • Venting Safety Inspected
  • Check air intake capability
  • Check limit control
  • Check fan control
  • Check for gas valve leaks
  • Oil all motors with ports
  • Check plenum temperature
  • Check air flow
  • Check humidifier


  • Check A/C at Thermostat
  • Check Furnace Filter
  • Furnace noise level normal
  • A/C Unit noise level normal
  • Check evaporator drainage
  • Check refrigerant pressures
  • Check all A/C components amp draw
  • Check capacitors for leakage
  • Check all electrical connections
  • Check wall disconnect
  • Check fuse condition and size
  • Check contactor
  • Clean condenser coil
  • Check air flow and temp at register
  • Set humidifier to summer position
  • Check condensate pump operation


  • Check Furnace Filter
  • Check Heat Pump Winter Mode
  • Humidifier Operation
  • Refrigerant Charge Inspection
  • Cycle System in Ht./Cool Mode
  • Check refrigerant pressures
  • Check drain for obstructions

Contact us today to learn more about our Maintenance Plan options.


If you would like a copy of your equipment instruction manual, please contact us today!

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Replacement Filters and Parts

Filters-Our service department carries a variety of filters and humidifier pads. We have a large number of these in stock and we are able to special order any filter by size, type, or efficiency.

Replacement filters include:

  • Standard Filters (1 inch and 1 inch pleated)
  • 5 inch Filters (Merv 10 and Merv 16 Ratings)
  • Airscreen Media
  • Aprilaire Filters

Humidifier pads include:

  • Aprilaire
  • Lennox
  • GeneralAire

Call us today! 636-240-HOFF (4633) or contact us by email.

Replacement Parts-We have a variety of parts in stock for all the do-it-yourselfers. Contact us today with the model and serial number of the system and the part that is needed.

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Hoff Heating and A/C is a Member of the Air conditioning contractors of America St. Louis, MO Hoff Heating and Cooling is a Mistubishi Electric Partner Hoff Heating and A/C is a proud supporter of habitat for humanity Hoff HVAC is a proud member of the national association of home builders Hoff HVAC is a proud supporter and member of the Missouri Propane Gas Association Hoff HVAC is a member of the North American Technician Excellence