[quote=“Alex_Ivaylov, post:1, topic:56571”]
Hi guys,
I am new to home automation so please bear with me 
I really like the idea of the Nest Thermostat but I don’t have central heating so I cant use it. Instead, I use electric heater fans that plug straight into the mains.
I was wandering if I can use the multi sensor to get the temperature and then use the smart plug to turn it on and off automatically?[/quote]
You certainly can, there is a virtual thermostat somewhere around here that will allow you to use the multi sensor as thermal input and allow you to set the thermostat. This will let you use any app that needs a thermostat.
[quote]
Can I do things such as set an IFTTT recipe when temperature is under 20 °C to switch on and when it’s 25 to switch off?
What about making it only do it when I am home? And what if I just want to turn it off?
What if I want to increase or decrease the temperature? Is there an easier way than editing the recipes? [/quote]
Any of these can be done once you set up the virtual thermostat. Many apps for that, they treat the virtual thermostat as if it were a slightly smart one.
[quote]
And what if I get an Amazon Echo? Can I tell Alexa to change the temperature or to just switch it off?[/quote]
I have the echo, but haven’t tried it yet, YMMV.
[quote]
I have looked everywhere for something like the Nest Thermostat that would work with electrical heating fan but couldn’t find any. Do you guys know any solutions?[/quote]
Use the heavy duty plug in switches as mentioned above.
Here is a virtual thermostat solution that someone has worked out: