Garage grow in uk, help

Hi am looking for bit of advice,

Looking at garage grow, well insulated but temp drop would be a problem with the lights off, so question is how to keep temps ok, heater, air conditioning or what do the more experienced guys suggest.
Maybe try go led for stealth, tho has is tried and tested lol

Any helpful info be great, as I know the people on here are very knowledgeable
Thanks

just a heater with a thermostat wired in

Heater, A/C, humidifier, dehumidifier. Depending on your local climate of course.

I'm the same as you. Temp drops at night. Bit warm during the day.

I have my lights running over night keeping it a bit warmer during the cool hours, off for the warmer parts of the day. I also have a low wattage heater on a thermostat. Plus of course good ventilation (in and out).
Good luck!