I use "Sonoff TH10, or TH16".
It is a box that gets programmed by the phone for turn on temp, turn off temp & time of day. It can work over the internet or not. (small box with external temp sensor)
Next picture is what I use for the chicken heat and cooling. It cannot be controlled by remote. Simple to set the temp.
House thermostats are built for 24Vac and most will not work directly at 220Vac.
Thanks everyone, I used a bimetal 0-45C thermostat that took a little while to adjust, but once dialled in it's giving me a consistent interval of 23C-26C oscillating every 30mins. Might add some thermal mass to my insulated box to prolong this interval.
All in all, very pleased with results. Thank you again for this suggestion. I really like that this is a simple one component solution that will run reliably for ages.