The Efficiency Tango: A Deeper Look at Geothermal Heat Pump Efficiency
A couple weeks ago, I compared the efficiency of the two most advanced geothermal heat pumps (GHPs) recently launched by Waterfurnace Renewable Energy (TSX:WFI, OTC:WFIFF) and Climatemaster, as division of LSB Industries (NYSE:LXU). Like most things in life, it turns out that heat pump efficiency is a lot more complicated than just comparing a couple numbers.
Since I concluded that Waterfurnace’s 7 Series heat pumps were slightly more efficient than Climatemaster’s Trilogy 40 pumps, one of Climatemaster’s district managers pointed me to third party efficiency ratings conducted according to standards set by the Air Conditioning, Heating, and Refrigeration Institute (AHRI). He compared Waterfurnace’s 4 ton unit (the most efficient 7 Series) to Climatemaster’s 2.5 ton unit (the most efficient Trilogy 40), noting that the former had a 41 EER at ground loop conditions, while the latter had a 42.1 EER, according to AHRI.