There is an indoor fireplace and we are debating a gas firepit outside.  

I manage an HOA that does not allow pets, to include indoor pets like cats. 

But still I think the rental risk associated with this is huge, and it doesn't seem to be a protected family status thing, but rather a lifestyle thing along the lines of practicing bagpipes indoors all day long (they say you can hear bagpipes 10 miles away = LOUD).Just my 2 cents. 

Tenant agrees to maintain the indoor temperature at no less than 50 degrees fahrenheit.

I just found a really good article on How to Safely Eliminate Indoor Mold at Realty Times.

.$100 entertainment$400 insurances and medicine (now on medicare with the extras included)$30 property taxes (remember this is personal property so taxes are very low)$12 mobile home annual registration$9 pickle ball indoor club$150 fuel (I just bought a 1990 Suzuki's Swift on craigslist for $2200 – 44 mpg)$35 vehicle registrations in South Dakota(only counting two of five vehicles)$2395 (this is based on two people, two vehicles etc.)

We asked around and a few of the neighbors showed us what they did to convert the indoor garage into a separate apartment or extra bedroom. 

The most common indoor molds are Cladosporium, Penicillium, Aspergillus, and Alternaria, which are mostly just allergens to those with sensitivities.As for the stain blocking paint idea, that can be a dangerous tactic, even after you have completely dried out the mold.  

Since lead may be present in paint, old pipes, or in the soil outside and tracked indoors.

This could cost a few hundred dollars per unit or per building but you will get an itemized list of what is wrong and what you can do to prevent future issues.Another option for encaspulating your indoor window sills and aprons would be to just replace them.