by KaiserJeep » Fri 21 Nov 2014, 14:35:49
$this->bbcode_second_pass_quote('Mesuge', 'K')aiser, are your aware of the simple fact, that the german passivehaus is basically the posterchild of hitech contraption, not that desirable for the longterm, perhaps even midterm outlook we face. Well, you can replace the oem air recuperation unit by diy version of lower efficiency, but you certainly can't locally replace the little computers and sensors, tiny electric motors and pumps, double-triple glazed gas filled windows, and most importantely all these vapour barrier fabrics around, bellow and on top of the house..
Certainly you can bet on the rosy future scenario that no repairs or damage will occur in say next 2-4decades, and or that some pocket of industrial countries overseas will still be able to produce these spare/replacement materials and ship them safely into your place somewhere in the heartland if necessary.
It's up to you, I'd not go that route, unless being very rich, i.e. "always" able to relocate and buy new properties willy nilly.
Sorry, there is no free lunch, that's not how this universe works, and the human society due to its short attention span can only provide illusions about that.
FYI, the Passive House standard requires:
Energy consumption for heating/cooling below 4746 BTU per square foot per year.
Total energy consumption for all heating, hot water, and electricity below 37900 BTU per square foot per year.
Air leakage that is less than 0.6 times the total house volume per hour, measured in a Blower Door Test at 50 Pascals air pressure.
There are no requirements for thermostats, pumps, computers, sensors, the heat recovery ventilation you discussed, or indeed even electricity. You can achieve the standard via high tech or low tech means and I am not surprised that the Germans went high tech. BTW, every major window supplier in the USA is offering triple-glazed windows at this time, it is no longer necessary to import such windows.
What Passive House really is, is a standard and construction techniques aimed at a goal of a healthy house without drafts or other discomforts, that can be constructed for roughly a 5-10% premium over a similar sized new structure that complies with current local building codes and note such brand new structures typically use 10X or more the energy of a Passive House. There are about two dozen certified Passive Houses in the USA, with another few dozen under construction.
Almost all contractors are not trained or certified to build such structures, and in entirely typical behavior, they are criticizing things they know little about - like whomever filled your head with twaddle on this topic. Or perhaps you heard about all the early Passive Homes built 10 years or more ago in Europe, before appropriate design goals existed. Many such homes are indeed uncomfortable just as you described, but NOT those being built today.
My intent, by the way, is actually to build an "Energy Plus" home, completely off the grid, that generates enough of an energy surplus to run an electric vehicle level 2 fast charger. The super-insulated shell will be so effective as to not require any form of furnace, and the body heat from two people plus waste heat from cooking and lighting will keep it comfortable all Winter - and the windows can be opened in Summer, which is not so extreme in Wisconsin right next to Lake Michigan anyways. Nor has anyone I know of ever had a well go dry that is only about a hundred feet or less from a Great Lake, full of fresh water.
YES, I fully understand that the embodied energy in such a home will be enormous. I will use recycled materials as long as their use will not compromise performance, but I believe that fairly soon after the crash, the construction of new Passive Homes, or the retrofit of existing structures, will become unaffordable to someone with a Middle Class income.
Ask yourself what YOU will be doing when the cost of heating and cooling a home is tenfold what it is today. I myself will be living in a comfortable home with functional automatic heat and cooling. Most other people will be skulking through public lands, stealing firewood, and living all Winter with their entire family in a single room. If you ever paid more than $200/month to heat the home you are in, you are not living in a place that anybody with a Middle Class income can afford to heat after oil, gas, and coal get expensive.
Tech does not frighten me, by the way, my profession is Electrical Engineering, and I believe I can keep the house running and expect to modify any systems that need modification if original parts cannot be acquired, with my tools in a workshop in the barn/garage. I believe that as long as I have the means to build such a Passive House structure, it would be extremely foolish to have any other goal. After all, money in the bank will become worthless almost overnight, spend it while you have it.
Recently we had a thread about an Earth-sheltered home built by member MonteQuest. He has a plan to keep warm, and so do I. You can either make a plan to keep warm in a way you can afford, or go South for the Winter. If you think you can sit in place until the "government" rescues you, well good luck with that.
I understand TANSTAAFL means. Yet I choose to build a new home in an area where real estate values are still declining, and I can buy a not-so-old equivalent sized existing home for about half what it costs to build. I believe that many such conventional structures - even including brand new homes built to existing obsolete building codes - will be abandoned by those who can no longer afford to heat them, and that these homes and their contents will end up being burned by others for fuel.