Rialto furnace install work is heavily replacement-driven because most of the city is 1960s-2000s tract construction with much of that equipment now at or past replacement age. Central and south Rialto homes built 1960s-1980s commonly still run 80% AFUE gas furnaces — well past 20-year service life with cracked heat exchanger risk. Replacement-with-upgrade to 95%+ AFUE wins on SoCalGas rebates ($200-$800), gas savings, and safety. North Rialto newer subdivisions (1990s-2000s) usually run 90-95% AFUE condensing equipment already and replacement is straight equipment swap. Foothill Boulevard light commercial install is its own category — rooftop unit (RTU) heating section installs and replacements for retail, fast food, small offices.