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Eokokok t1_jeg69n0 wrote

Reply to comment by netz_pirat in Heat Pumps could supply 20% of building heating by 2030. Supercritical CO2 heat pump sales in Japan have now reached a total of 8.5 million units. by DisasterousGiraffe

Great work done in worst order possible. Since obviously you are proud enough of it to come here with it you won't insulate. So you are still wasting money. And if you insulate your pump will have issues being significantly too big.

So no, you should insulate first either way, unless you have 700 square meters that would justify that energy need or live in Anchorage.

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netz_pirat t1_jegdq60 wrote

You have to realize that people have limited money. Of course the best way to go would have been to buy the house, insulate the roof, the walls, change all windows and the heating at the same time.

But we can't afford that. So we start with the point that saves us the most money, is mandated by the government and subsidized by 50%.

At this point, we have costs for heating of about 1500€ a year. Upgraded roof insulation could bring that down to 1000, but would cost approx. 30k so it would pay for itself in 60 years at current prices, at that time I am 97. Walls have a similar ROI, Windows are worse.

Well insulate the roof when we redo the tiles, we'll insulate the walls when we renew the paint,... And when we are done with that, we probably approach end of life of the heat pump anyway.

Oh, and by the way, energy efficiency class C(after renos) or D (before the renos) is nowhere near as bad as you claim it is.

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