Although this isn’t low wattage, if I get something like this maybe I don’t need a separate heater and fan, since this is both? …. Vornado AVH10 Vortex Heater with Auto Climate Control, 2 Heat Settings, Fan Only Option, Digital Display, Advanced Safety Features, Whole Room, White https://www.amazon.com/dp/B00SVIOFNG/ref=cm_sw_r_cp_api_glt_i_JR9S6CF2X7H0JCYKK0MA?_encoding=UTF8&psc=1
This Vornado Space Heater is life-changing for keeping temp regulated. It’s got a thermostat so you can set an exact temperature and it’s really good at circulating air with low noise. You might need a couple of these for 700 square feet, but it’s so nice having having “set it and forget it” even heating.
They’ve got other models too if you prefer a different look or want a remote, but I and a couple friends/family members have been using this one for years and been really happy with it.
This is the one I bought (got it on Amazon):
Lol unfortunately!!
Good luck with your windows, even if it's not "true winter," cold wind doesn't sound fun.
https://www.amazon.com/Vornado-EH1-0096-43-Automatic-Climate-Control/dp/B00SVIOFNG
Deal link: Amazon