Many geothermal and general contractors pay a subcontractor to perform Manual J calculations when its required.  Accurate heating and cooling loads are absolutely critical to properly designing a geothermal system (See 4 Steps to Designing a Geothermal System) and according to Ryan Carda creator of Loop Links, its the number one more common mistake that geothermal designers make in the design process. If you’re new to geothermal, download the geothermal survival kit to get a better understanding of how the technology works.

In many states, it is now a requirement to perform a manual J calculation to pull a permit for any HVAC job. If you are a general contractor or geothermal installer it will pay to do your own Manual J calculations because so much of the job depends upon accurate loads.  Continue reading to learn the 11 tips to creating the best Manual J calculations for your job.