Greetings everyone!

    I have a technical questions I hope I could get some feedback! I understood that air source heat pumps are very efficient because of their ductless configuration. I have been told by a very smart person that adding a duct to a airsource heat pump (Daikin has now a unit that comes with duct) does not diminish with any great significance the efficiency of the unit.  

   I of course have my reasons to believe that using ducts is increasing the liability to the system, but I like to refrain my reasons so I do not "influence" your thoughts...   

   Your thoughts?, which systems would you prefer? There are two working situations for this conversation, one is a 60 x 40 open floor, one room building (no kitchen, and no bathroom -just a working space); the other one is a 3 bedroom system home about 2500sq (both units are going to be air sealed and properly insulated. 

   Thank you everyone! 

Luis

Tags: air, duct, ductless, efficiency, heat, minisplits, pump, source

Views: 200

Reply to This

Replies to This Discussion

Equipment is rated for it's configuration (ducted or ductless). So you can compare equipment efficiencies directly. However, a ductless system has no distribution losses. A ducted system would have losses if the ducts are in unconditioned space. A ducted system will also have higher fan energy.

Now does a ducted minisplit has the same efficiency as a ductless? Yes & No. If it's a single indoor head & single outdoor condenser, Yes. But if it's a multi indoor head set up with 1 outdoor unit, there is usually an efficiency drop (rated).

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Hal Skinner replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"I found the buildingscience article interesting.  Interesting that they noted the wet bottom…"
8 hours ago
Bud Poll replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"With conduction that ends at the bottom of the joists and convection that is naturally suppressed…"
9 hours ago
Hal Skinner replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Good morning Bud, Took a quick look at the site and a couple others listed on the Yahoo…"
11 hours ago
Bud Poll replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Hi Hal, Search "Basecalc basement heat loss".  From memory Canada (nrcan) has/had a…"
12 hours ago
Michael Dunseith posted photos
yesterday
Hal Skinner replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"II just remembered seeing a report by a federal adency, many years ago, that basically said …"
yesterday
Don Fitchett commented on Tom White's video
Thumbnail

Alliant Energy's PowerHouse TV: Sealing Leaky Ductwork

"Very educational. thanks for sharing Tom."
yesterday
Hal Skinner posted a discussion

How much heat energy is lost through the floor of a house?

I am asking this as I do not recall anyone speaking of any study to this end.  Many comments about…See More
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service