Well I’m not bold enough to say it’s the best option… but I’ve got my c14 wrapped in heat/sound insulating foam they use for cars. I got it off eBay and it similar to this stuff:
https://www.ebay.com.au/itm/22315217...mis&media=COPY
It a cheaper and I reckon would give better insulation than the reflectix imho. It sticks on so it’s more of a permanent solution and if I ever choose to take it off it’s going to cause a terrible mess- but it seems to work well flattening out the temperature drops (still need to adjust focus every hour for dso imaging) and reduces heat gradients. Advantage of it being stuck in is that it acts as a vibration dampener and it was really easy to cut to size. I never need to adjust it and it’s really heavy duty. It’s not particularly pretty, but I really don’t care - I don’t think anyone buys a c14 cause of its looks!!
Note that a good dew shield and dew heater are still absolute necessities even when wrapped. My dew shield extends 550mm and on a very dewy night still can get some condensation if I’m aiming at the meridian.