For $30, today's side deal gets you a comprehensive 16-point seasonal cooling- or heating-system cleaning and safety check from Randazzo Heating and Cooling, a $110 value. Randazzo's staff will come out to check the furnace or air conditioning of homes within most of metro Detroit; check to be sure your home falls within Randazzo's service area.

A proper furnace or air-conditioner cleaning and safety check will not only help your machine run more efficiently (and therefore save you money on utility bills), it will ensure that your seasonal survival boxes are free of harmful molds. You'll also head off expensive breakdowns and repairs with this dose of preventative maintenance. Among other things, Randazzo will replace filters, remove debris from the blowers, lubricate moving parts, and check the suction pressure throughout the system.

The family-owned Randazzo Heating and Cooling has, among the members of its staff, more than 50 years of experience cooling the hottest days and warming the most bitterly cold. Peter Randazzo and his experienced technical squad are forbidden from breaking a sweat in even the most heated, difficult repairs or diagnostics.