You most certainly can and many do! (Including us!)
If you choose not to practice in heat, then it does help to be very vigorous in Pranayama and Half Moon to get the heta into your body.
But … “yoga is yoga” and despite the many claimed benefits of the heat (some of which have a deal of dubious pseudo-science to them!), just doing the yoga poses and paying attention to your body will of course be beneficial.
You will notice a difference without the heat & humidity of course and it may even feel as if you don’t stretch quite so much – so it pays to be aware of what is going on in your body.
If you do want to include heat (and humidity) then generally you will need something better than a typical home heater – they are usually regulated to switch off below the sorts of temperatures we like, for safety reasons.
There are a ton of threads on here about practicing at home and also setting up with heat – just use the search function and you’ll find them – and you can also read about Gabrielle’s “Home Practice Kit” product here:
http://www.hotyogamasterclass.com/hot-yoga-at-home.htm
🙂
