Thats ok and it shouldn’t be much to get them down to 70f at night now they are entering their 2nd week…seedling stage is just about over so the higher heat for them at night is too. They can continue to sustain the higher heat at night for another week or 2 if necessary as sometimes it is though preferably will go down to ~65-70F at night (78-83f day) so when they go into their 3" pots on Friday they’ll have 3 days to settle before their light transition for sexing
Not really when looking at your outside temps warmin up adding to the inside heat…thermo conductivity and what not per my hvac friends irl…do I have hvac friends here? If so, please speak up Anyway, as far as I understand it is your temps are raising which is adding to your heat indoors…the heat indoors goes into the tent which heats up even more before it hopefully goes out a window or it recirculates heating up the cool air entering the room adding to the heat in already in the tent
Here is you local forecast
and compare it to mine
Your a good month ahead of me so you’ll be turning your fan up and indoor heat down in increments sooner to maintain 65-70f night and 78-83f day in the tent from here on out
Its a balance…learning that balance for your individual environment is the hardest part of indoor growing especially as the seasons change