About us

SummerSun Heat & Air

A Holistic Approach to Indoor Air Quality

Gary Mertz, owner of SummerSun Heat & Air and sister company Harvest Moon Energy, has over 30-years experience in commercial and residential construction, maintenance, and energy management. He has been an active member of the DFW community for over 12 years, providing heating and air-conditioning services and energy consultation to all of North Texas.

"We saw a need for quality indoor heat and air conditioning services."

Gary saw a need in the residential market for comprehensive planning and consulting on indoor air quality and started his company, Harvest Moon Energy in 2005. Harvest Moon Energy, also located in the DFW Metroplex, provides home energy auditing and reporting and related services, including: Insulation evaluation and improvements, Air duct efficiency measurement, Planning and improvement, Air duct cleaning, and more.







"Delivering quality and building relationships based on trust."




To keep up with the growing needs of his clients, Gary Mertz has now expanded his services with SummerSun Heat & Air, providing high quality, dependable and trustworthy heat and air conditioning services.

SummerSun educates clients to help them make smart choices based on budget and return on investment, building trust on every project. “We pride ourselves on our honesty and integrity”, says Gary Mertz, “and have built successful businesses based on client referrals and word of mouth.”

SummerSun Heat & Air provides superior services to North Texas residential and commercial clients:

  • Heat & Air Conditioning
  • Ventilation Services
  • Air Balancing
  • Preventative
  • System Performance Grading
  • Harvest Moon Energy home energy audit and reporting

Building a business on trust and relationships

Want to know more about SummerSun Heat & Air?

Call us at 214-415-4867 or find us on: