I KNOW that it was about 90 degrees today, so a thread about heater MAY not be what you want to see.
BUT... my local walmart (hanover, PA) had 1500w ceramic heaters on clearance for $5.00 I go one to keep in my trailer just in case. If you wait till the fall, It will cost you a bit more.
Plan ahead Save some dough!
here's the link to the website description
http://www.walmart.com/ip/Sunbeam-Ceramic-Heater/12338793 (//%22http://www.walmart.com/ip/Sunbeam-Ceramic-Heater/12338793%22)
Mark