When a piano moves to a new home, it lands in a room with different temperature and humidity. It needs a few weeks to adjust before tuning, so the tuning holds instead of shifting as the piano settles. This is true even for a move across town in the Fort Worth area.
If you bought a used piano and do not know when it was last tuned, assume it has drifted. Many have dropped well below standard pitch after years without service. Clare's checks the pitch on site and, if needed, does a pitch raise first so the fine tuning can hold.
Keep a piano away from direct sun, heating and cooling vents, and exterior doors where possible. Steady temperature and humidity help any piano hold its tuning longer, which matters in a climate with swings as wide as North Texas.