Preventative Maintenance

  • Optimizes unit performance
  • Extends equipment life
  • Promotes energy savings
  • Improves indoor air quality
  • Quarterly Maintenance, which we recommend, includes:
    -inspection of motors and belts                 -visual inspection of coils
    -electrical inspection                                   -amp readings
    -drive pulleys                                                -temperature differentials
    -drain cleaning                                             -advanced notice for mold and
    -insulation and new filters                             algae control
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Service, Warranty and Repairs

  • Worn or faulty electrical component replacement
  • Sealed refrigerant system repairs, leaks, etc
  • Compressor failure diagnostics and remedy
  • Coil cleaning
  • Condensate pan and line flush
  • Drive motor replacements
  • Economizer repair and replacement
  • Air Diffuser upgrades
  • Thermostat upgrades
Sales, Service and Installation

  • Existing unit retrofits
  • New Unit installation
  • Second Opinions
  • Air Flow Analysis
  • Curb adapters and factory curb installation for utilizing existing duct
  • Crane services available
Unit Replacements

  • RTU Rooftop Units 2 tons to 100 tons
  • Split Systems 1 ton to 30 tons
  • PTAC Window Units 1 ton to 5 tons
  • Air Handlers 2 tons to 30 tons
Emergency A/C Rentals
  • Emergency cooling rental at customer’s request
  • Contact us for pricing

PTAC Unit Sales and Service

  • Shipping within United States
  • Personal Delivery and Installation within Texas

Leasing and Financing

  • Leasing program available for commercial customers
  • Financing available with good credit
Knox Service Company
State of Texas
License Number:


2090 1/2 Harland Dr.
Houston, TX 77055
(713) 691-3433