phaeton wrote:

Any tips are greatly appreciated...

You might classify which houses are more suitable for solar house heating.
People don't seem to put any premium on that yet, eg on which way a house
faces, shading, age, existing heating system, and so on. An ideal house might

1. Have a long south wall (or SE or SW.)

2. With few windows on that south wall (so a sunspace won't block them.)

3. With the south wall facing the back yard, vs the road.

4. With no significant shading on the south wall.

5. With no significant other projecting features from the south wall, like
decks, swimming pools, stairways, and so on, ie a "plain flat south wall."

6. With electric resistance forced-air heat, which is expensive to use,
so the house would tend to sell for a lower price, altho it might also
have more insulation than usual, to make up for the expensive fuel. Also,
the non-recurring cost of electric heat is low compared to other systems,
and that tends to lower the price of such a house. And forced-air can be
more suitable for sunspace heating than hydronic systems, eg baseboard
radiators or hydronic floors.

7. Recently built, with lots of insulation and airtightness. An "Energy
Star" house with a blower door test might be a good candidate...

Nick