From the panel show about: Keeping the grow room warm in the winter

Midwestkevin6101 – The main thing is to not let the heat you generate out.  Insulate.  Pandafilm a room around it if necessary.  Use enough watts at all times by running a day and a night cycle grows.  1000w DE bulbs can be used if you have enough headspace, they need like 4 foot clearance to the canopy.  They are actually quite efficient and put off a little UV light which enhances terpene and resin production.  The high intensity also produces extra dense buds.  You can also use heat mats under your plants if it is still very cold.

Matrixresetinprogress – Use the co2 burner has a heat source. Interchanged with a small area heater. Winter time produces the best flowers. Grind time.