Preventive Maintenance is vital to the operating efficiency of your equipment. That's why we offer an annual Preventive Maintenance Program. This program can help prevent problems, extend the life of your system and save you money in the long run. See the details below.

Service Agreement Details


  • One FREE Heating & Cooling Service Hour(Per year, during normal hours)

  • Exclusive 10% Discount on Heating & Cooling Parts

  • Priority Scheduling on all Service Calls & Guaranteed Same Day ServiceWe call you, so you don’t have to worry about remembering to call us. 

  • Scheduled Spring 22 Point Tune-Up & Scheduled Fall 21 Point Tune-Up. See the full tune-up details below.

  • Standard Filters Included



1st System

$140.00*^ Annually 

Each Additional System is $100.00*^ Annually 

Out of Town Additional Rate $65.00* Annually 


*plus tax, ^price includes standard filters only.

Pleated and high efficiency filters are an additional cost.

Standard Tune-Up Details

Customized solutions will contain the same tune-up specs, only they may be performed more often & at different times, depending on the solution that best fits your equipment's needs.

​Fall : 21 Point Tune Up 


Gas Furnace 

Check Gas Pressure 

Check Heat Exchanger Cells 

Check Heat Exchanger Manifold 

Check Gas Valve Operation 

Check & Clean Pilot/Igniter 

Check Burners 

Check & Clean Burner Crossovers 

Check All Safety Controls 

Check Blower Motor Rotation 

Check Blower Motor Amps

Oil Blower Motor 

Check Blower Motor Bearings 

Change or Clean Air Filter 

Check For Gas Leaks 

Check Flue Pipe 

Check Humidifier Pad 

Check Water Connection & Drain 

Check Thermostat Operation 

Set Heat Anticipator 

Tighten All Screws      


Heat Pump/Electric Furnace 

Check All Electric Heating Elements 

Check Amps 

Check All Electrical Connections 

Check Emergency Heat Switch & Operation 

Check Defrost Control & Operation 

Check 4 Way Valve Operation 

Check Outdoor Thermostat/Operation 

Check Compressor Amps

​Spring : 22 Point Tune Up  


Check Compressor Amps 

Check Condenser Fan Motor & Shield 

Check Condenser Fan Blade 

Oil Condenser Fan Motor

Check Condenser Motor Amps 

Chemically Clean Condenser Coil 

Check Compressor Contactor 

Check Compressor Safety Overloads 

Check Relays and Capacitors 

Check Refrigerant Charge 

Check Evaporator Coil 

Check Temperature Drop Across Coil 

Check & Clean Drain Trap & Line 

Change or Clean Air Filter 

Check Blower Bearings 

Check Blower Wheel 

Check Blower Belts 

Check Blower Amps 

Oil Blower Motor 

Check Wheel Rotation 

Check Thermostat 

Tighten Caps & Screws

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Regular Office Hours :

M- F, 8 am to 5 pm (Closed 12-1pm)


After Hours Service Available on

Nights, Holidays & Weekends.



Derdens provides Electrical and HVAC sales, services and repairs for Stuttgart, Roe, Ulm, Casscoe, Clarendon, Brinkley, Almyra, DeWitt, Lodges Corner, England, Des Arc, DeValls Bluff, and nearby surrounding areas. 


Areas outside of Stuttgart will include mileage fees.



HVAC License #: 1556542017

Contractors License #: 0040140718

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