SteamyTea

Can you take the glazing out, fit the film, and hope the beading/seal keeps the water out. Maybe a smear of silicone as belt and braces.

But one very easy to test with a damp meter.

The fundamentals are the same as any heating system, just that sizing, heat losses and installation have to be done right. Just like any heating system. All you have to do it tell the tenant that if does not heat the air as quickly as an oversized gas boiler.

All corner need to have a large radius, can you get a cutter that can do that i.e. is there enough stone to centre the cutter in the right place? I have a large angle grinder with a large diamond blade on it.

Geometry.

So was Robert Maxwell. Czechs bounce.

Yes they are, keep reminding then of their despicable past.

Or one of the worse metrics. Insulation levels would be a good one, £/(linear metre.U-Value)

Contamination and ecology reports maybe.

Time before last I was in Bristol they had still not installed electricity. But now they have these, comes with a plug in the original packaging.

RTFM Here is, as an example, an Ecodan one.

Had that once, took ages to work out what it was.

Can you plug in a small, cheap, dehumidifier every evening?

Seems your system is working right. Do you collect data all the time on the air temperatures? Phew, got away with it. And you have a nice cosy house.

Good luck with that, if you think it is hard to find someone that knows about ASHPs you will really struggle to find someone that has experience with multiple heat sources.

Bit of education and guess work. The airflow though the heat exchanger will be fairly rapid, so the air will not cool too much as the volume will be quite high. Though at 95% RH, it may well happen, but on a very small scale. Could well happen if the fan stops. And it may have frosted up, Joe90 has not reported back.

The sun is still low this time of year. 23.74° at noon yesterday, will be 59.82° on the 20th June.

@joe90 Quick check before bedtime 23:30PM Your dewpoint temperature is now at 1.4°C, your outdoor conditions are 1.9°C and 95% RH, So looks like you should not freeze up. But only by the skin of its teeth.

Oversize the heat pump. why sizing is so important and cannot be directly compared to a thermal boiler. They work different ways. But you should be able to get a flow temperature above 25°C easily.

Your dewpoint temperature is now at 3°C, your outdoor conditions are 6°C and 81% RH, so a while to go.

Unless there is a real constriction of airlflow, not really. Image putting a fan heater in an alleyway, you would not have to be far away before you cannot feel it.

Not really, they draw in lots of air, not sunshine. So while it may feel, to a person, hot in the sun and cold in the shade, the air is at the same temperature.

@TonyT Be interesting to do an energy analysis on it. As a general note, can't remember much talk about ASHPs actually frosting up in previous winters. @joe90 Be interesting to see if it frosts during the day. Your dewpoint temp is currently 5.2⁰C. 10⁰C here at the moment and quite pleasant. Was going to post a picture up, but seems the forum has got a problem. https://postimg.cc/Jt2JTzZR

I am intrigued. Are you, in effect, preheating the air going into the heat exhanger?