Meet The Division Specialists

Darwin Bachman

Office: Des Moines, IA

Years With Dennis Supply: 38

Lines Responsible For: Darwin assists dealers with a wide variety of needs including refrigeration and all areas of HVAC. On the commercial refrigeration side, he assists dealers with design and layout options.

Much of Darwin's day deals with technical issues from a wide variety of products and applications. From compressors to rooftops, Darwin can be a tremendous asset.


Greg Averill

Office: Omaha, NE

Years With Dennis Supply: 19

Lines Responsible For: Lochinvar, Bell & Gossett, Watts Radiant, Heat Transfer Products, Amtrol.

Greg’s many years working with Hydronics has benefited our customers with his extensive product knowledge, design and layout services he provides.

He daily assists our customers with product selections and technical assistance with the major manufactures such as: Burnham, Tekmar, Armstrong pumps, and Raypak to mention just a few. Greg has been an ASHRAE member since 1978.


Keith Havener

Office: Sioux City, IA

Years With Dennis Supply: 14

Lines Responsible For: Keith offers service and troubleshooting support for the Nortek, Allied, Mitsubishi and Bosch product lines. Other responsibilities are service training, warranty support and OEM parts inventory management.

Keith is a NATE certified Nortek Service Adviser and Mitsubishi Diamond Service Group technical adviser.


Jeff Blodgett

Office: Council Bluffs, IA

Years With Dennis Supply: 36

Lines Responsible For: Jeff maintains much of the hydronics inventory at Dennis Supply, both parts and equipment. He works with contractors on quotes and trouble-shooting service issues.

Jeff completed a course in Air Conditioning and Refrigeration offered locally. He has attended the Lochinvar Service Training program. Jeff also recently completed a course on Steam Plant Operations offered by the National Association of Power Engineers.

Before coming to Dennis Supply in 1982, Jeff spent 5 1/2 years in the field focusing on plumbing and hydronics.


Mike Ostdiek

Office: Lincoln, NE

Years With Dennis Supply: 5

Lines Responsible For: Allied Commercial, Airease, Ducane, Mitsubishi

Associates Degree Southeast Community College HVAC Program 26 years in industry

Mike is the HVAC manager for Dennis Supply. He specializes in controls and is our commercial equipment estimator.