Hamstra installed a new HVAC system in our house and has been maintaining it under a service contract. We could not be happier with the system or with the service. All of the Hamstra personnel, including the appointment schedulers, the engineer who designed the appropriate HVAC system for the house, the installers and the maintenance crew have been great to work with. They are friendly, polite, clearly well trained and highly competent to do their jobs efficiently and effectively. This company has a great set of business values that are reflected in all who work for them.