Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

1797 posts

Uber Geek
+1 received by user: 120

Topic # 189074 16-Dec-2015 11:01
Send private message

We've got a house we want to install a heatpump in. We originally thought an underfloor ducted system would be best as we want to be able to heat/cool/dry the bedrooms separately from the lounge, however since taking posession i'm not sure we have enough underfloor space (~400mm but in some places less). 

What clearance will we need to use an underfloor ducted heatpump? The alternative is to use an internal ceiling mounted pump, but the house has a skillion ceiling so there is no roof space... I could lower the ceiling in the hallway, but would only have about 300mm between the lowered lining and underside of the existing ceiling. Would this be enough? I think I need about 7kw for the living space (42m2, 2.7-3.2m ceiling) but would also want to heat the bedrooms (~9m2 each).

Am I dreaming, trying to fit a heatpump in somewhere other than on the walls? 

Create new topic
14144 posts

Uber Geek
+1 received by user: 2546


  Reply # 1451429 16-Dec-2015 11:28
Send private message

You should probably ask an installer. 40cm is pretty tight to get into, and some places won't go under houses. Lowering the ceiling sounds like a pain in the butt.

My very old but reasonably well insulated house has a Nocria heat pump heating the living area, and the areas with bedrooms, maybe 60 - 70 square meters. It works well, even going around two corners into one bedroom. I have a 10kw heat pump, it's much more effective than the older 7kw heat pump that I moved to another part of the house. If your house is modern you may get away with 7kw. Ducted I would be wanting more like 10 - 15kw.

AWS Certified Solution Architect Professional, Sysop Administrator Associate, and Developer Associate
TOGAF certified enterprise architect
Professional photographer

Hmm, what to write...
996 posts

Ultimate Geek
+1 received by user: 506


  Reply # 1451431 16-Dec-2015 11:31
Send private message

It could be done with that space. However you might need to do a bit of digging around the indoor unit so that everything will fit. Obviously access to get the unit and plenums needs to be considered too. Don't forget you are going to need to get under house for other things later on as well.

So in all likelihood Possible but not easy/cheap


182 posts

Master Geek
+1 received by user: 25

  Reply # 1451607 16-Dec-2015 14:27
Send private message

A 10kw -12.5 kW ducted unit is somewhere around 330 - 360mm deep so doesn't leave much room. The flexible ducting will be smaller than this, say 300mm and gets smaller as you get further from the unit.
I'd recommend you get an installer to have a look and give you a quote as every house/situation is different.

1797 posts

Uber Geek
+1 received by user: 120

  Reply # 1451701 16-Dec-2015 16:15
Send private message

Cheers all. 

Yeah will get an installer to have a look at it in the new year, but was interested to know whether I am going to need to spend a month convincing swmbo that one option is better than another (cost and feasibility-wise).

The house needs a lot of work so dropping ceilings isn't an issue (i'm going to be putting new ceiling linings on every ceiling anyway so I can get some insulation between existing and new). 

We'll just wait and see I guess. 

Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.