I was previously advised that a gas stove in the basement could even be 24k btu (specific model I had in mind) because I only need to bring the temp up 10degree from 60 to 70 degrees (I have central air conditioning). However I have found I cannot do an install in the basement. So I am thinking of doing in my living room in the first floor. First floor is 1250 sq ft and has family room with a high ceiling of 17 ft. I know I need to bump up the btu. Would 30k btu be ok or should I spring for a 40k btu? The difference in cost is $1000 all in. I live in NJ.