In the USA most people have heating/cooling systems that regulate temperatures. I have found that root growth is strongest with phals in Fall when temperatures are cooling, if outdoors. Most of mine are kept under lights in Winter and that raises the ambient temperature.
My Winter house temperature is a constant 70f but does increase if days are sunny.
So a heat mat mat in Winter may be desirable if your house heating temperature is low - which for me would be around 60f. People I met from Minnesota grow phals around that temperature in Winter ( no heat mats ) and then obviously that minimum increases in Summer.
If you have the space and sheltered spot, I recommend that you place your phals outdoors when temperatures are consistently around 60f minimum and bring them indoors when temperatures hit around 55f for a few days. Looking at mine now there is great root growth and most are spiking.
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