New natural gas furnace and heat pump installed, 4 days after technician found a cracked block on the old one. Attached red tag mean fuel shutoff for 4 days, cool inside as outside temperature dipped to freezing at night. Old furnace was 20 years old on an expected 15 year life, we switched out air conditioner in year 10 of a 13-year life because cooling and heating are now integrated as a system. (Riverside neighbourhood, Toronto, Ontario) 20231113