Check that the contractor holds an Idaho State HVAC contractor or specialty contractor certificate. Find out about certification requirements for contractors in Idaho at the State of Idaho Division of Building Safety website. The Idaho Division of Building Safety requires that Heating Ventilation and Cooling contractors have a valid Idaho State HVAC contractor or specialty contractor certificate.
Ask for referrals from friends, neighbors and co-workers.
Ask contractors for customer references and call those references.
The contractor should spend time inspecting your current system and assessing your needs. For example: the size of the heating and cooling system should be based on the size of your house, level of insulation and windows. A good contractor will inspect your duct system (if applicable) for air leaks and measure air flow to make sure your system is meeting manufacturer specifications.
Get a written and itemized estimate. Be sure to compare cost, energy efficiency and warranties. The lowest price might not be the best deal if it’s not the most efficient option, because your energy costs could be higher.
Always have a signed written proposal with the contractor before work begins. The proposal should specify costs, model numbers, job schedule and warranty information. Never let a job begin without one.