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Cleaning the Filters


Ultimate HVAC is a Mitsubishi Diamond contractor, and we have invested in the training necessary to professional repair and maintain mini-split heat pumps regardless of brand.

Click the Mitsubishi logo above to learn more about the ductless mini-splits we carry.

Ultimate HVAC Heating and Cooling Coupons Skokie IL Mitsubishi Special mini split.png
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Before you call us, check these items to ensure you really the help of our professional service techs:

  • Remote control batteries: Most mini split heat pumps operate with a wireless remote control. Make sure your remote control has fresh batteries.

  • Double-check your system mode: Make sure that at least one zone is set to on and the desired temperature is set well below ambient for cooling operation, or well above ambient for heating

  • Check your circuit breaker: To ensure that you have not had a nuisance trip and your heat pump system does have power.

  • Is your system in defrost mode? If you are operating in the heat mode, make sure that your system is not in “Defrost” mode

  • In heat mode, give it a few minutes: If your breaker was off, after turning the power on, give it a few minutes: many systems have a built-in time delay.

  • Check your filters: Check your indoor unit filters. If your filters have not been cleaned lately, clean them now.

After checking these items, if your mini split heat pump is still off or running improperly call us and we’ll dispatch a service tech to help! With our service guarantee, you never have to worry that the service you receive will be less than the best.

ULTIMATE HVAC is your local Mitsubishi Diamond Contractor



Get your 12 Year Parts & 12 Year Compressor Warranty only offered by Diamond Contractors

We are here to take care of all your ductless split system needs.
Call or click today to schedule ductless system service.

Common mini split heat pump service issues that require professional help include:

  • Refrigerant line leaks caused by improper installation or mechanical damage

  • System or a zone fails to start

  • System or zone comes on, but heats or cools improperly. This is typically caused by refrigerant loss typically due to improper installation

  • Inconsistent temperature or wide temperature swings

  • Condensation leaks from indoor units. This is typically cause by indoor units being out of level, or improper condensate line installation.

  • Noisy operation indoors or out

  • Changes in heating or cooling capability over time

If your mini split heat pump is fine today but you want to make sure you're ready for either winter or summer weather, consider our seasonal maintenance program. With our Comfort Club, either once or twice a year, we’ll schedule a complete system check to ensure your system is ready for the cooling or heating season.

If you’re considering a new mini-split heat pump system, we offer free estimates for new system installations. Click here for our details on our mini-split systems.

Hands Repairing Air Conditioner



Ultimate HVAC is local owned and has decades of experience providing water heater installation and service for Skokie area homeowners and businesses.

 Guarantee Peace of Mind

Ultimate HVAC is committed to your needs and satisfaction regarding water heating, HVAC or indoor air quality.

mitsubishi diamond dealer

We have completed manufacturer training and are a Mitsubishi Diamond and Armstrong Pro and Contractor.

We've been an Accredited Better Business Bureau member since 2017, and we are more than proud of our A+ BBB rating!

Nate Certified heating and cooling contractor.

Ultimate HVAC is EPA refrigeration and air conditioning certified.

Ultimate HVAC is licensed and insured to do furnace, boiler, air conditioning, and water heating work throughout Cook County.

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