24/7 Emergency Service (417) 725-2512

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(417) 725-2512

“Dirt and neglect are the top causes of heating and cooling system inefficiency and failure. To ensure efficient system operation, it’s important to perform routine maintenance. Proper maintenance by a qualified technician is one of the most important steps you can take to prevent future problems.”


  • Clean condenser with cleaner and remove debris
  • Check compressor operation
  • Check refrigerant levels
  • Check motors, capacitors and contactors
  • Check evaporator coil for operation and cleanliness
  • Clean condensate drains
  • Clean/replace air filters*</li
  • Check/reprogram thermostat
  • Royalty dollars towards the purchase of a new system**


  • Clean burners and flame sensor
  • Vacuum inside of furnace/air handler
  • Check heat exchanger
  • Check gas pressure
  • Check limits, relays and circuit boards
  • Check/oil motors
  • Clean condensate drains
  • Clean/replace air filters*
  • Check/reprogram thermostat
  • Replace thermostat batteries
  • Check defrost cycle/refrigerant (Heat pump only)

Maintenance Benefits

  • Regular Inspections can reduce breakdowns by as much as 95% and lower utility bills as much as 30%
  • Insures maximum efficiency
  • Potential problems are spotted before trouble and major expenses occur
  • Having your system cleaned helps make the air that circulates inside your home cleaner. This can reduce irritants and symptoms of allergies.

*Includes up to 4 standard size, MERV 8, 1″ pleated filters or 2 MERV 8 standard 4″ pleated filters per year

**Royalty Dollars accrue at the rate of $25.00 per year with consecutive years of membership. Maximum accrual of $750.00.

We’re happy to provide our customers with our Royal Customer Maintenance Plans. Download the Maintenance Plan PDF below to learn more about what this program includes.

Maintenance Plan PDF

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Special Offers

$100 Off Any New Furnace or Air Conditioner

Expires 12/31/24. For residential customers only. Not valid with any other offer.

Honored At All Locations

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Google Reviews

Wendy S
Wendy S
00:38 17 Mar 22
We have used Knight for 20+ years for our HVAC maintenance and repairs and have always been happy with their service. ... When it came time to replace our system we didn't think twice about who to call. Knight's team was exceptional. They made the whole process super easy and stress-free. Thanks to Ken, the guys that installed the units and a huge thank you to Stephanie!read more
Jeanette Shaw
Jeanette Shaw
21:59 25 Feb 20
They are always fast in response
Adana Fishback
Adana Fishback
02:14 24 Nov 19
Great bunch of people!
Donna Moore
Donna Moore
10:27 07 Sep 19
Bret did a great job identifying the issue and clarifying the problem and walked me through the cost of replacement. It... was early evening so very late in the day for him, yet he was friendly and positive as he finished the repair work. He also gave me some cleaning tips that will help my system perform better!!read more
Rick Johnson
Rick Johnson
01:06 04 Sep 19
On time. Great work. Highly recommended.
Diana Caffey
Diana Caffey
16:19 21 Aug 19
We are very pleased of the two young men, Bret and Gary who came in to our home and got the job down. They were very... polite, seems like they never took a break, did not leave a mess, and respected our home. Knight Heating and Air Conditioning in our book needs a10 star review!!!read more
Sherrie Lynn
Sherrie Lynn
02:00 05 Dec 18
This company went above my expectations on service. In the begining of fall we had heater issues. The consumer service... at beginning and ending were outstanding. The tech was able to locate a motor and install within 24 hours.read more
Thomas driver
Thomas driver
12:22 26 Aug 18
Had another major company come out to diagnose my HVAC issue. They quoted me $600 for all kinds of repairs that didn't... sound right so I declined their service and called knight. Their tech Kevin came out and found the issue in minutes..... simple wiring problem. Total charge $80.read more
Debra Corbin
Debra Corbin
19:52 16 Jun 18
The entire process was perfection. Brandon and Ethan are conscientious and capable installers . Thanks Jeff , we're... chilling out this weekendread more
Patricia Marston
Patricia Marston
21:28 18 Apr 18
Extremely Ethical and Knowledgeable company to hire.I replaced both my 20 year old furnaces, and air conditioner... systems in my home.They went the extra mile for me. A BIG THANK YOU to Jeff and his Crew.read more
carla Yoder
carla Yoder
22:54 23 May 17
I have used Knight heating and air for years!! I highly recommend!! Any and every time I have needed to call them for... service needs, new installation, or problem solving, they are fast to respond. Honest and great customer service. Thanks Ozark Knight heating and Air for always doing a great job!!!read more
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