For most Wheaton homeowners replacing an air conditioner, a 16–18 SEER2 system offers the best balance of upfront cost and long-term savings. The federally mandated minimum for Illinois (SEER2 14.3) is often not the best value despite lower upfront cost, while ultra-high SEER2 (25+) systems rarely pay back in Illinois’s moderate cooling season. Here’s how to calculate the right choice for your home.
The SEER2 question trips up a lot of Wheaton homeowners because contractors often present options without clearly explaining the payback math. Let’s cut through the noise with actual numbers for DuPage County conditions.