400w grow attic

sup peeps

I currently got a 400w hps and am planning on growing 10-12 autoflowering strains in my attic but have 1 small problem

Would my 400w stay cool up there without a ruk . i reckon it might be too cold tbh concidering its winter in the uk so its never above 5 degrese celceius and the air flow is good

I have an air cooled 1k watt in a 60 degree basement, and can barely get temps above 70. In the summer I could see it being a problem without help though. For now getting temps UP might be your issue.

If you have an area that is framed off and insulated, you don't need much to keep it warm.
I use a heater very simular to this 1
http://www.homedepot.com/Electrical-Portable-Heaters-Humidifiers-Portable-Heaters/h_d1/N-5yc1vZbve7/R-202295910/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053

It heats a 3 sq meter area easy.

Good Luck