Heating, Air Conditioning, Fridge, HVAC/Heat Pump

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Question
Joseph,
On an air sourced heat pump,with a 5 KW heat strip for Aux. heat only, what temp. should the outside temp. lockout thermostat be set at? Can you run the heat pump down to 0 deg.F. and still get any benefit from the heat pump? or should you just let the heat strip heat the house? I've got the outside thermostat set at 25 deg. F. right now.

Answer
Forrest,

I've been to many  Heat Pump residences here in New England and they do not lock out the outdoor unit for the most part unless they are hooked to a fossil fuel kits, granted the HP will run  very long times before it shuts off, locking your HP out at 25 or any other degree  is your choice, and running pure electric. Your home/condo must be small as a 5 KW heater is not a very large element. At 240 volts expect to run around 18 amps. at 208 volt expect to run around 20 amps.Your outdoor meter will be spinning pretty good at those amperages. In comparison to your Heat Pump running somewhere around 6- 8 amps on a small tonnage unit.

Heating, Air Conditioning, Fridge, HVAC

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Joe

Expertise

40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.

Experience

Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Education/Credentials
Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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