About Us

Logterman LLC is a family owned and operated business. We have been providing Residential and Commercial HVAC Installation and Service to the Delavan Lake area for over 12 years.


Our goal is to provide energy efficient comfort systems for your home or business.

We have grown over the years, building a network of satisfied customers and a reputation for timely professional service at a fair price.

We would love the opportunity to provide you with a quote for new install or schedule a seasonal maintenance visit with one of our service technicians.

Call us Today!  (262) 215-4950
Schedule an Appointment Online

The Logterman LLC Team:


Ryan Logterman
Ryan is the owner of Logterman, LLC, and Osborn Recycling. He has over 15 years experience in the HVAC industry and is a Certified Solar Installer

Ryan spends most of his time managing the team, as well as estimating and managing the larger projects including new construction, remodels, commercial accounts, and radiant, geothermal and solar installations. 

The best part of the job for Ryan has to be the relationships he has formed over the years with staff, suppliers, customers, and other contractors. Ryan also enjoys working towards being more ‘Green’. He strives to encourage the use of renewable energy systems to save energy and money, and to benefit the environment.

John Schwartz
John is our Lead Service Technician, and has been with us since 2011. John has over 12 years experience in the HVAC industry, and has his degree in Heating, Cooling and Refrigeration. He is also NATE Certified

John is able to diagnose and repair all makes and models of residential and light commercial HVAC systems. He provides customers with a fair and honest assessment of their system and offers options based on the condition and lifespan of their equipment. 

If you ask John what he enjoys most about his job, he would probably say rooftops, attics, and crawlspaces (especially those with raccoons in residence). John is an avid outdoorsman, and in his free time enjoys fishing and hunting with his 2 yellow labs.

Noah Racette

Noah is our Installation Technician, and has been with us since October 2014. Noah has 10 years experience in HVAC installation, including custom sheetmetal fabrication. He has OSHA Certification, and ESCO Institute Universal Certification for Refrigeration.


Noah specializes in hydronics and geothermal systems as well as heavy commercial and industrial projects. He excels in working with exposed ductwork and industrial ventilation. Through his attention to detail, Noah is able to provide the highest quality of installation and takes satisfaction in seeing the end result of a project well done.