Company History

LennoxRandy Gilray graduated from Lakeshore Technical Institute in Manitowoc, WI in May 1974 with an Associates Degree in Gas & Oil Burner Servicing.

When Randy moved to the Wausau area in 1974, he began working for his Grandfather, Harrot Narlow, at Narlow’s Oil Burner Service servicing customers in Wausau and Birnamwood. Harrot introduced Randy to Richard, John, and Chuck Malone of Malone-Wausau Oil. A short time later, Randy began working for Malone-Wausau Oil. A year later, Randy joined the Riiser Oil Company and quickly became the lead service technician.

Gilray Heating Service was started in September 1981 by Randall Gilray and Patricia Gilray specializing in oil heating and hydronic heating. Although the company was initially doing only oil & hydronic heating service, it became apparent that servicing all types of heating and cooling equipment was in high demand in the Wausau area. With the growth of the company into gas heating and air conditioning came a name change to Gilray Heating & Cooling Service, Inc.

Even though technology may be changing faster than we can imagine, Randy has found that long term relationships with quality manufacturers and their products produces the best results. Gilray Heating & Cooling Service, Inc. has been a Lennox dealer since 1985, a Thermo-Pride dealer since 1981, Crown Oil boiler dealer since 1984 and a Honeywell Flame Safeguard Trained Technician since 1985.
In 2012, Randy’s son, Ethan, joined the family business after graduating from UW-Platteville with Bachelor’s Degree in Mechanical Engineering. This training has given Gilray heating another perspective into the HVAC industry. He has also completed a month long training course through Lennox in Dallas, Texas with Top Tech honors. Through that training, he also received NATE certification in air conditioning, gas furnaces, oil furnaces, hydronics, and air distribution. Ethan was also nominated for and then joined a Lennox Technical Committee which provides other Lennox dealers with training and solutions to problems.

Gilray Heating & Cooling Service has serviced most brands of oil and gas furnaces that are in the local market and many are nationally known. Many brands of equipment have come and gone since 1973 when Randy started in this profession, however being aware that clients need heating and cooling 24 hours a day, Gilray Heating & Cooling has always maintained a 24 hr. emergency service for those that call after normal hours, no matter what the brand of equipment. We service what we sell and install, plus we will service brands that other contractors can't be bothered with, even their own brand.
Since the beginning of the company, Gilray Heating & Cooling Service has stayed on the forefront of most new technology that was changing our industry. High quality products, efficiency testing, the Lennox Pulse gas furnace, which was the first 90% + A.F.U.E. gas furnace, new types of air conditioning refrigerant, technician certification, and the list goes on.

We are primarily a residential service contractor. We are experienced in fuel oil, natural gas, LP gas, solar, geothermal and wood as energy sources.

The main type of heating we deal with is forced air, yet we have great experience with all types of hydronic heating. Conventional hot water boilers, steam systems, radiant infloor heating, baseboard, radiators and fan coils are a few of the types of system that we work on. Similarly, central air conditioners and heat pumps, along with ductless systems have been installed and serviced by Gilray for over 30 years.

While the Wausau area is growing, many people are buying homes, both new and used. Many of these homes come with a type of Homeowners Warranty. We have been an Authorized Service Contractor since the mid 1990's providing warranty work for almost 10 different homeowner warranty companies.

Our service technicians are based in Wausau and cover most of Marathon County. We even have customers that also request us to service their cottages in Northern Wisconsin and the Michigan border.