As some of you know I am uprooting myself and planning on building a new 'Stead. Its been coming for some time but My partner and I have recently purchased land and are preparing our households for sale.
A great deal of technologies have matured in the last 15 years and the next house will incorporate a lot of those technologies while maintaining the low running costs of this one.
Main construction: ICF right to the rafters. This home used an ICF basement and traditional above ground framing. The cost for doing it yourself has fallen so that apart from much more labour the material costs are in line with each other. You end up with a completely sealed structure with R28 walls and no thermal breaks. The energy cost of the concrete is high of course but the lower energy costs of lifetime operation makes it balance out within 3 years. Windows will be triple paned north shield
https://www.northshield.ca/windows/casement-windows/ I've used them before and the price has come down as the technology has matured.
Heating and cooling is still up in the air. The plan for this house will be an all electric.That was a tough decision because I am a very conservative builder but the time is right. Backup heat and cooking will be looked after by a battery bank and inverter for a hotplate and to run the heat pump. Induction cookstoves, on demand electric hot water, grid tied solar, radiant heat, and geothermal are all in the batting cage. The winners will have to undergo some Darwinian scrutiny and also answer to budget pressure.
Geothermal is looking good though. 15 years ago geothermal was specialized and insanely expensive. Today you have choices. I'm looking into a kit myself where the unit come precharged with refrigerant, the ground loops are pre measured, concentrated antifreeze is shipped to you, the water pump unit is unpressurised so no air purging... The list goes on and on and gets a little technical but someone took a good hard look at all the elements that made geothermal expensive (mostly specialized labour) and solved them. I'm looking at this company here:
https://www.123zeroenergy.com/geocool-2-0-ton-geothermal-heat-pump-with-install-package.html. The same company does cold weather air to liquid heat pumps for heating and cooling... Cheaper and less work.
Solar is my baby so I will be installing a net metered array either on the roof or the ground depending on final home design and approval from the aesthetic committee. I looked at offgrid as that is where my heart lies but I do not want a propane backup genny again and it would defeat the whole all electric vibe. There will be an offgrid array feeding a limited amount of house loads though. The reason for going ongrid with the main array is largely the way the utility costs are going. Propane prices fluctuate as much as 100 percent over the course of a year and that is in a time of record low gas prices. At some point the price will rebound and I do not want to be on the wrong side of the fossil fuel curve. On the electric side Ontario has a large hydroelectric and nuclear supply of electricity which is fairly green but expensive. the cost of delivery has stabilized but the cost of a KW Hr of electricity is going up. Currently in a rural low density area in ontario its about $0.25 per KW Hr with delivery. If you can take out the consumption side with a solar array it can make for very affordable energy. Yes electric heat is inefficient compared to gas but if you add in geothermal you gain back that efficiency and more with the 3 to 1 heat gain magic of compressors. Again its early days. A 10kW solar array can produce about 120000kWHR a year in my area. If we find in the first year that we can make due with an all electric resistive heating system that is the path we will take... Its hard to model since the home will be crazy efficient... There is another element which is you have to think of it as an investment. I could take the money I'll spend on solar put it in a savings account and make 2 to 3 percent on the money which I will then pay tax on or I can invest it in solar which will reduce my home operating costs thereby acting like a 6 to 8 percent return on my money without a tax burden... In this era of crazy volatility in the markets and extremely low interest on safe investments if you have the money to invest solar is worth it!!!
Cheers, NF