Preferred Maintenance

The Leading Angola HVAC Contractor

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For over 16 years now, our locally-owned and operated business has provided local homeowners and business owners with everything that they need to keep their homes and businesses comfortable all year long.


Whether you're looking for a new heating system or an air conditioner to keep your home or business comfortable through the hot summer months, our NATE certified team has you covered.

Choose us for reliable service and quality products

Get equipment from the most trusted names around

• Bryant cooling equipment

• Mitsubishi mini-split air conditioners

• Honeywell Lyric thermostats

• Aprilaire air quality products

• AO Smith water heaters

• Bradford White water heaters

Get more information on our high-quality products



Amazing products that will

last for years to come

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Korte is proud to be a NATE certified contractor! However you may not know what NATE means for you as our customer. Continue reading to learn more about NATE certification.


The North American Technician Excellent (NATE) organization helps homeowners find superior installation and maintenance or service of heating, ventilation, air conditioning or refrigeration systems. NATE- certified technicians are skilled professionals who have proven their knowledge in the HVAC/R industry by passing specialized NATE certification tests.


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