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"The Toshiba website says we need 4kw ish. So it should be sufficient. With that said. The installer admitted that the build has said to put in a heat pump that was just about enough to safe cost. I wish I did more research before accepting this one."
A Toshiba cassette is a really strange thing to have in a new house. Cassettes usually cost more as they must have a condensation pump built in.
"For us, during the day, if it is sunny, which it pretty much always is here, day time is not an issue for the living and lounge. It get's to hot, yes even in winter. As soon as the sun goes away the temp in the house drops real fast. Hence the question if there is a way to get this tested."
Typical New Zealand thermal non design. A thermal imaging camera should give some idea where and how much heat is being lost.
"My windows are 2.9 long, 3.2 and 1.1 wide and all 2.2 heigh and one is .6 x 2.9. So quite a big surface to loose heat."
The building code is weak and only requires R0.26 for windows. If you have solid aluminium windows (nearly all new houses in the North Island do) and basic glazing units with no low e you'll be losing heat like mad out of those, maybe 15kW a day out of the above during winter compared with 6.5kW from good thermally broken + low e joinery, excluding curtains.
You can buy thermal backing for curtains cheaply and retrofit them to improve heat loss.
Fred99:
R value of windows including double glazed is pretty poor. Well fitted drapes or blinds add about 0.25 to R values.
Standardised numbers tend to use conservative old figures meaning weak pyrolytic low-e and old attempts at thermally break aluminium. R-windows for uPVC are influenced by the typically larger frame size: if you want the same glass area the window has to be larger meaning less wall which has far higher R values, so it can be misleading.
This happened to the house I'm in despite different companies' staff installing the ceiling versus walls. Part of the ceiling insulation was omitted (out of sight) not counting on home owner checking for it.The owner of the company was not happy as presumably they were taking the insulation and doing side jobs. The exterior walls had only half width pink batts so someone took the full width and replaced them with half width.
"Ceiling insulation make the biggest difference to a house at about 42%, but walls are 24%. That implies windows are about 25% as well."
It can be 50% if the house is otherwise insulated. Many new houses have huge windows but minimum spec joinery meaning they lose the same amount through the windows as a 1990s house while overheating terribly in summer from lack of shading.
"Covenants are a good thing IMO. On the plus side, you can easily choose to not build in an area that has covenants you don't like. "
Section supply without covenants is very low in some places.
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