RQS Crits - First Grow

I notice over the past three weeks that temperatures, air; substrate and solution, have gone down considerably. Mid 60's from early 70's. I'm a fan of warm substrate & solution as I think cold really halts growth, veg or flower. Air temp can get cold to tell the plant Winter-Is_Coming, but I won't now sacrifice warm substrate & solution. I don't think you have defoliated too much, although I find when I defoliate it stresses plants and they take some days to recover, these days I add on to the projected harvest date. Example, three defoliations taking ~4 days to recover = 12 days to add on to projected harvest date.