 A bill introduced in the city council would require landlords to maintain an indoor temperature of no more than 78 degrees when the outdoor temperature tops 82. Building owners would have four years to comply or face fines of up to $1,250 a day. The Rent Stabilization Association, which represents some 25,000 New York City landlords, calls the proposal unaffordable. The health department says about 350 city residents die from the heat every year.