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If you live in a climate zone that doesn’t need cooling or you can live comfortably without it when it is hot, by far the best form of heating for its low risk of microbial growth is a gas- or propane-fired boiler.
Today’s boilers are small, wall mounted, quiet, produce little ambient heat for the room in which they are placed, and are highly efficient. 
 Also, natural gas and propane are the cleanest forms of fossil fuels. 
Boilers use a closed water system that doesn’t need to be filled, emptied, or changed.  If routine maintenance is required, it is accomplished by a professional who will drain the system via a hose with minimal, if any water spillage. 
The only challenge with boilers is that they don’t have a cooling component, so air conditioning wou...