A heat pump could win as the best HVAC technology, though a better drilling for ground-sourced ones. Just a shallow drilling (up to 100m) that works in retrofit mode, such as drilling from the basement, would be a great upgrade:<p>- No outdoor unit that looks awful in many settings<p>- works well, even in the coldest winter, without a spike in electricity usage, COP 5<p>- very reliable with long durability<p>- super quiet, no ambient noise<p>- 20% more efficient<p>Currently, drilling is very disruptive in retrofits, but there is progress in compact techniques that might change the equation.<p>Disclaimer: angel investor in <a href="https://www.flexdrill.at/" rel="nofollow">https://www.flexdrill.at/</a>
Friends in south Sweden and they got a hole drilled in the front yard like it’s the most normal thing. Is it there?
It's usually so much more expensive than an air source heat pump that makes it completely not worth it.