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Ducted heat pump sizing help

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Ducted heat pump sizing help

Posted On: September 11, 2023

Ducted heat pump sizing help

Hello all! I'm researching updating my houses current ducted heat pump system to a newer hyper/max heat system (16-18+ seer).


Typical 1997 built 2 story 1600sqft living space house with basement located near Columbus Ohio.


Current system is the OG 2.


5ton Lennox heat pump with a 15kw backup heat strip.


House only has electric for heat.


I've been talking with a local hvac guy and hvacdirect (local pickup in Dayton Ohio) about sizing.


I'm getting very different recommendations.


Local guy is saying to do a 3ton 36k system with a huge heat strip (like 20-30kw) while hvacdirect said to do a 5ton system with no heat strip based on heating btu's needed at cold temps (seems way oversized to me).


*EDIT: oops I think I misunderstood him, I think he meant a 20-30 btu heat strip, which would be like 8-10kw, make more sense.


*.


Based on my research I was thinking a 3ton 36k system.


Gree/Stealth system I'm looking at is rated to 28k btus at 5F so I would think that would be plenty for my house given current 15k heat strip can keep up.


I was debating adding a 10k heat strip to help during defrost.


This seem reasonable or should I be doing something else?


Question from user lowfategg at heatpumps at reddit.


Answer:


When your current system has been working well, did it cool and heat OK? If yes, you do not need more capacity.


If it cycled during the hottest days, it has excess AC capacity.


Many equipment options are in whole tons only.


Even if you needed 5 tons for heating, your ducts would not manage that.


And noisy too.


Note that adding blown in attic insulation is fast and affordable.


Conflicts between heating and cooling capacity can occur.


If you have to lean on e heat, that is what it is.


With air handlers, e heat augments to what the HP is still producing unless it gets so.


cold, the HP will not run.


Ducting? Doubling CFM produces 4 times the pressure and 8 time more blower power.


Answer from user Dean-KS at heatpumps at reddit.



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Twintech were fast and efficient contractors. It only took 48 hours between an initial home visit and complete installation. The workmen were polite and hardworking. The site was left clean with the old furnace etc. removed. They helped arrange an environmental assessment in order that I could receive the maximum rebate. They even called me within a week to determine if I was satisfied with their work and to reassure me that I could call them anytime I experienced heating difficulties or had any questions. I recommend Twintech for your heating problems.

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My old air conditioner was 20 years old and developed a Freon leak and it was more cost effective to replace rather than repair. There are a large number of heating and air conditioning companies available in my area so I contacted several for quotes. Twintech heating and cooling responded quickly to the inquiry I left on their website and their sales person Dave came by the following day. He was knowledgeable about the field and was able to show copies of the various refrigeration and gas fitting licenses along with workmens compensation, TSSA and other certifications. He also suggested a particular manufacturer and model of AC unit appropriate to my house and gave me a quote. Since the price was reasonable, service had been good and the reviews on the internet were also good, I decided to purchase an AC unit from them. Installation was quickly scheduled. They showed up on time, did a good job installing the new unit including some sheet metal work to get the new heat exchanger to fit in the furnace duct, and cleaned up afterward. In addition, they noticed that my existing AC was installed too close to the furnace exhaust (based on building code) and were able to mount the new AC the appropriate distance from the exhaust. Overall, they did an excellent job and were a pleasure to work with.

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Twintech's Salesman Dave arrived promptly was friendly and courteous, listened and assured us the installation would be completed according to our requests. The crew arrived early morning on May 11th, 2018 and worked through till late afternoon non-stop. They were very friendly, very professional, their expertise was excellent, their workmanship outstanding and the installation was completed in a timely and efficient manner. We were completely satisfied and happy with the quality of the work.

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by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

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