Vent-Free Gas Products Provide Home Heating Advantages
In the vast majority of homes in the U.S., vent-free gas heating products don’t generate enough water vapor to raise indoor humidity levels and foster mold growth, according to a recent study commissioned by the Vent-Free Gas Products Alliance of the Gas Appliance Manufacturers Association.
Since 1980, vent-free gas space heaters, fireplaces, logs, inserts and stoves have been used for supplemental heating in more than 10 million American homes, the alliance says.
The appliances are 99% energy efficient, enabling home owners to reduce heating costs by turning down the thermostat. Most vent-free gas products do not use electricity, so they are a reliable source of heat even during severe electric power outages.
Vent-free products are as much as 60% less expensive to install than traditional masonry fireplaces, the alliance adds.
The following information is available online from the alliance:
The executive summary of “Impacts of Vent-Free Gas Heating Products on Indoor Relative Humidity
The executive summary of “The Effect of Properly Sized and Operated Vent-Free Gas Products on Indoor Air Quality”
In the vast majority of homes in the U.S., vent-free gas heating products don’t generate enough water vapor to raise indoor humidity levels and foster mold growth, according to a recent study commissioned by the 
