Bruh make rentals have mandatory insulation or something, we spend 100kwh a day in heating the house to 18C with a reverse cycle heat pump system
this post was submitted on 12 Jul 2023
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this is absolutely needed. a minimum viable energy efficiency standard in order to lease to renters. if it doesn’t meet the minimum standards sell it to someone who will upgrade it or build a new property
100% agree
18C in Winter or 18C in Summer! One is fair, the other is crazy!
Haha heating to 18C right now during the winter, it's 3-10C at night and 13-19C durung the day. Aussie here too
Which part of Aus? Sounds cold. What's the house made out of?
Did you see that article about how anything under 16 is bad for your health?
I'm in a cold part of Sydney. The house is brick (single brick in many areas), the floor has no insulation and neither does half of the ceiling. Thermal camera shows brick walls at about 12C while it's 20C outdoors. Typical indoor temperatures without heating are single digit most of the time, maybe peak at 12C for the day.
Do you have a link to this article?
Edit: why the downvotes?
I hate the downvotes too. I dont understand why we need them in small communities. I'll go looking, Lemmy's search isn't great.
I'll edit it back in soon.
https://aussie.zone/post/355545 - Guardian article. I talk about our place in there, which sounds similar to yours but in QLD. We get to near 0 in Winter. Warm days though.
Even under 18 is regarded as bad.
Personally I'm in an old brick apartment in Brisbane and this time of year it's regularly below that indoors. I can physically feel the air leaving through the gaps under the front door or under the sliding glass windows. The insulation is just terrible.
We need performance based standards not fluffy star rating systems. Or at least tie stars to a performance standard.
I.e. kW power required to keep building at habitable temperature in given conditions. +Blower door test to prove air tightness standards met.
Isn't that sort of what NatHERS already does? It's measured in theoretical terms but it at least seems to estimate how much energy would be required for regulating temperature. Among many other things, it includes a section where it reports the "thermal performance" of both heating and cooling (separately) in terms of MJ/m^2.
As a side note, a 2015 Qld Govt report stated:
In 2009 it was anticipated that the move to 6-star housing would generally increase building costs by around 1.25 per cent on average depending on the home’s design, size and location
It also noted that this would result in cheaper ongoing energy costs, but I wonder if some sort of up-front rebate or stamp duty discount or something could help incentivise building at 6 or 7 stars NatHERS.
They called them 'Thermal Assessors' in the article.
We moved into a relatively new house in Jan, we didn't think anything needed doing. We've found out terribly thermally inefficient. Since moving in we've installed roof heat extractor, ceiling insulation, garage door insulation and we're thinking about getting the windows tinted before summer.
Does the tint cut the heat coming through?
Our old place we put 5 extractors on with closable vents in each room because the roof was a skillion and couldn't clear it with 1 or 2. Made a big difference in Summer.
Depending on the type of tinting, yeah it can cut quote a lot of heat coming in. You have to balance how much heat to cut vs how dark the tinting will be though.
Will it stop cold going the other way?
Apparently so with certain types of film.
I’m intrigued about insulating garage door, I didn’t know that was possible. Did it make the temperature more stable in winter & summer in the garage? Did it have an impact to temperature inside your house?
We've done it to a double wide panel door facing west, the garage was sweltering in summer and lost a lot of heat in winter. The laundry was in there, so it got used a fair bit.
The insulation was styrofoam panels that wedged into each of the panels of the door. Seemed to help a bit in summer, but I also should've added brushes to the sides to close the gap on either side.
would love to see a speedy rollout and approach to this but that feels like i’m asking too much
Pink batts! The horror!
Yeah this has been a bit of a passion of mine for a while.
We've got hydronic heating and I've always thought it would make a great way to move sustainable heat energy around the home.
A while ago I was looking into how to make wood powered but then I read about sand batteries and started doing the calculations on how much sand and heat energy we'd need to store a useable amount of heat to keep us warm in winter in Melbourne.
Turns out the answer is a fuckload. We've got a 6 star house that we built ourselves 9 years ago. we got double glazing and the high range r2.7 wall insulation and r5 or 6 in the ceiling. Its a two story house with approximately 223m2 of wall (including windows) and 106m2 of ceiling.
I calculated approximately (and didn't bother including windows so would actually be much higher) that we were in fact heating the whole neighborhood
At 7c ambient temperature, and if we want the house at 22c, we were bleeding about 27670 BTUs, another way of putting it is we'd need about 8kw of energy per hour to maintain the temperature.
In America and Europe they are building walls with an R value of 13 or 14. Here a 90mm stud wall with cement sheet weather boards, R2.7 insulation and 10mm plaster comes in at about r2.92
We'll never be able to generate enough renewable heat if we just let it all go so easily.
Unfortunately, there is no easy retrofit fix. The best I've been able to come up with is building a second stud wall around the perimeter of the house to create some airgap but that has it's own issues.
But reaching that goal would hurt profits...
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