Hi Lisam? There are space heaters available, which draw fresh air in from the outside and expel exhaust gases out through the same specially designed double-wall vent fitting. They mount to an external wall, and no electricity is needed because they have Piezo ignition. They are thermostatically controlled, have no noisy fan and have fully modulating burners. Sizes are: 5,600, 8,400 & 14,000btu input. If you would like more info e-mailed to you, please e-mail me at firstname.lastname@example.org . Best regards, Brian.