If you’re new to the geothermal heat pump industry, read the Geothermal 101 Reading list. It has free tools and articles on geothermal design and installation, and sales and marketing best practices.

Click here to sign up for a free product training on real time geothermal monitoring so that you actually measuring the COP of an operating unit.

Click here to read Lessons Learned on Ground Loop Sizing from 100,000+ Hours of Real Time Geothermal Monitoring Data

Click here to read Lessons Learned on Operating COPs from 100,000+ Hours of Real Time Geo Data

Click here to read Performance Based Contracting is the Future of Residential Geo

HeatSpring’s ‘Top 50 Most Efficient Geothermal Heat Pump’ rankings have been taken down, due to an overwhelming amount of inquiries and feedback.  The data we used to compile the rankings were legitimate and we attempted to be fair to all equipment manufacturers – the decision to take down the rankings, in spite of the integrity that went into them, was based on two factors:

1. The parameters of our rankings were open to legitimate criticism.  We obviously had to pick some parameters, but many criticized this is as bias.  Examples: Why only include AHRI data?  Why only include units with capacities between 45000 and 51000 Btu/hr GLHP cooling?  Almost every manufacturer is the best in some way, so picking a single metric for efficiency was misleading if taken out of context.

2. We didn’t intend to illicit such a negative response.  The spirit of the rankings was supposed to be positive and celebratory – not a slight against those not included.  The last thing we want is to make it harder for a GHP sales rep to do their job and help the industry grow.  What this response tells us is that the GHP equipment market is extremely competitive and almost everybody is putting out great products.  The GHP consumer is winning, and that bodes well for the long-term health of the GHP industry.

HeatSpring Learning Institute is committed to educating the GHP industry, and remaining a trusted source for information.  We have a series of follow-up articles planned, including “Installer’s Guide to Geothermal Heat Pump Selection”, and more comprehensive GHP Performance rankings.  We’ll continue to post comments below, so everyone can learn from the conversation.  I’ll even post a few comments that came in off-line from friends and colleagues who raised legitimate concerns.

Thanks to all who reached out with feedback over the past 36 hours.  Please continue to share your thoughts and opinions about what consumers and geothermal professionals need to know about GHP equipment.

What do GHP Performance Ratings Mean?

Equipment performance ratings are the numbers we use to compare one manufacturer’s product to another – much as we use EPA gas mileage ratings to compare one car to another.  Like gas mileage ratings, equipment performance values do not always (actually almost never) reflect true installed-in-the-home performance.  Rather they are best used to compare similar equipment (furnace to furnace or GHP to GHP) of one manufacturer to another.  Unfortunately, the ratings used for different types of equipment (furnaces, ASHP, GHP) are not comparable, making direct comparisons between different types of equipment difficult. Ratings for all types of equipment are arranged such that higher values indicate more efficient equipment.  The major difference between GHP and ASHP ratings is that ASHP values are intended to reflect seasonal performance and GHP values are the results of tests carried out at a single set of specific laboratory conditions.

For an expanded discussion of equipment ratings see the Equipment Ratings section in HeatSpring’s ‘Geothermal Survival Kit’ written by Kevin Rafferty, PE.

Why Publish These Rankings?

To educate and encourage professionals to take an interest in geothermal heat pumps.  HeatSpring Learning Institute does not sell or promote any particular brand of GHP unit.  Our geothermal training courses teach students the fundamentals to work with all GHP brands.


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