I recently was able to use either Bonus or Sec 179 for a new AC (HVAC) for a commercial property because it's considered QIP 15 year.

Client with a residential rental purchased a new AC unit for approx. $6K.  My understanding is that section 179 is not allowed but I thought I could take bonus but the only way is to enter "1" for special depreciation in Lacerte depr screen.  Is this correct and bonus is allowed or is the only option the 27.5 years?