Mini Split for 500 Sq Ft: Cool Comfort + Cleaner Indoor Air

Mini split air conditioner cooling a bright 500-square-foot room as a homeowner uses a laser measure and tape measure to plan accurate BTU sizing.

Most sizing guides answer this in one line: 9,000 to 12,000 BTU. That range holds up. What it misses: an oversized mini split cools fast, shuts off, and never pulls enough moisture out, leaving rooms cold, clammy, and mold-prone. Here is the part that matters. The consumer page published by the Department of Energy recommends … Read more