Quality pianos need very special care.
One of the things I’ve noticed since I’ve had the piano is the very fine tolerances required to produce a piano of that quality in the first place, and how easy it is for the piano to become ‘out of alignment’, as it were. In my case, I found after a few months after I acquired it that the piano action was ‘bottoming out’, and I was getting a loud thump as the action was hitting something that it was not designed to do. This was easily fixed during a routine service, and Wayne revoiced the piano back to where it should have been.
This illustrates the point that pianos are not static – they do change over time and it takes a while for them to settle into a new environment. In practice, it was just over a year before equilibrium was achieved with the piano’s environment. Since that time, Wayne has only needed to make minor changes to the voicing. He has also installed some very powerful magnets to keep the mechanism even more firmly attached to the piano case. I suspect that if I ever needed a pacemaker this could cause problems…
Whilst I have an air-conditioner in my music room, it's not on all the time (being a scientist originally I do try to be a little bit green, in the ecological and non-Kermitian sense). I have heat film on the windows which helps to keep the temperature within reasonable bounds. Although the temperature outside may be more than 40° Celcius, in my music room it never gets above 30° Celcius.
In practice, the piano is much more affected by humidity changes than by temperature changes. I have a dehumidifier set to keep the humidity below 50% all the time. On humid days, this will take a large bucketful of moisture out of the air in about one day. Putting a dehumidifier inside the piano is definitely not an option here – Wayne’s view, which I agree with, is that this cure can be worse than the disease, hence the external dehumidifier which works extraordinarily well and is very quiet in operation.
The piano holds its pitch and tuning remarkably well. Over a period of time, we have noticed an overall drop in pitch of a couple of cents, but this is consistent over the whole range and is not noticeable in practice.
I wish I was as stable as the piano.