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Question
My house is 1800 sq. feet 3BR 2 1/2 bath ranch-style and my Unit is a 4 ton LP gas unit. There is only me in this house now.
Can I help reduce/control the heating and cooling of unused areas(extra bedrooms, etc.) without harming the system?  Is just shutting the duct vent cover sufficient to accomplish this? My return duct  has four 16x30"openings at the corner of the haallway.

My ex-spouse was a heating and AC contractor and said that shutting down rooms would affect the efficiency of the unit and wear it out....was this true?

Answer
Lynn,

You probably can get by with closing a room, too close several would not be good for the system, in cooling mode you may not be pushing enough air across the indoor coil, possible iceing the coil. In heat mode ,not enough air going across the heat exchanger may raise the bonnent temperature and possible trip a high limit control .Your remaining open ducts will probably be whistling also, as the air has to go somewhere.If you have fiberboard duct you may increase chances of it splitting.

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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.

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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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