Meet the division specialists

Darwin Bachman

Office: Des Moines, IA; Refrigeration/Mechanical Product Manager

Years With Dennis Supply: 41

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 is a tremendous asset.


Keith Havener

Office: Sioux City, IA; Operations Manager/Service Director

Years With Dennis Supply: 16

Lines Responsible For: Keith’s title Operations Manager/Service Director and he offers service and troubleshooting support for the Nortek, Allied and Mitsubishi product lines. Other responsibilities are service training, warranty support and OEM parts inventory management.

Keith is a NATE certified Nortek Service Adviser, Allied Service representative lever 4 and Mitsubishi Diamond Service Group technical adviser.


Jeff Blodgett

Office: Council Bluffs, IA; Hydronics

Years With Dennis Supply: 39

Lines Responsible For: Jeff is in Hydronic Sales and 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; HVAC Equipment Manager

Years With Dennis Supply: 8

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

Associates Degree Southeast Community College HVAC Program 29 years in industry

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


Mel Alexander

Office: Council Bluffs; Director of Hydronics/Geothermal Sales

Years With Dennis Supply: 2

Lines Responsible For: Bosch and Century geothermal units and supplies. Lochinvar and Bell & Gossett boilers, pumps and supplies. Heatlink floor radiant heating products.

Mel has 29 years of experience in the HVAC Industry specializing in geothermal / hydronics and many other specialty products.


Bill Gardner

Office: Des Moines, IA; Sales Manager

Years With Dennis Supply: 3

Lines Responsible For: Supporting the sales efforts and customer support at all 13 of our locations.

Bill is a graduate of Truman State University and has been involved in HVAC distribution for over 25 years. He is a NATE certified technician with a strong background in Hydronics, Geothermal, Ductless and Forced Air products.

Throughout his Wholesale HVAC career his responsibilities have included outside sales, branch manager, purchasing, technical service advisor, product/technical training, and manufacturer’s representative.