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Performed precision heat tune up on comandaire geothermal. Replaced Aprilaire 213 air filter. Checked all electrical conections and components. Did have some corrosion around loop circulator pump, but no water leaks. Checked air temperature rise which was 22 degrees. Also had a 7 degree water delta t . Which is good. Checked compressor amp draw, it was within specs. Geothermal is older but is working fine at time of service.