It is now 11.40 am. The 'liquid' thermometer in shrimp tank in the south facing kitchen reads 27 deg C (81 deg F); In cooler weather the heater keeps the tank at 23 C. This room has the roller blind half way down as we need enough light to see what we are doing.
The digital thermometer in the main tank in north facing dining room reads 25.2 C (77F). The heater usually keeps the temp at 23.5 C. The curtains are open at the moment but they'll be half closed mid afternoon.
We have a Galileo thermometer in the lounge - the 24 C glass bubble has sunk but the 26 C bubble is still floating. This room has a large south facing patio door and the curtains are closed while the north facing window curtains are open so there's plenty light in the room.
The room temperatures will rise during the afternoon as the outside temps will go up. Today's predicted maximum is 27 C and 28 C tomorrow, then 26 C on Saturday (they've changed that upwards since yesterday) and 20 C on Sunday so the tanks should start cooling again.