I submitted complaint against 661-580-8511 on Federal Do Not Call website.  It's easy:
https://complaints.donotcall.gov/complaint/complaintcheck.aspx

The more complaints filed, the bigger the fine if/when FCC finally tracks them down.
If FCC would offer a bounty, I'm sure we could all track them down through baiting.

According to www.411.com this is an invalid number.  Consequently, when a call from this number arrived today, I concluded this is a spoofer, illegal telemarketer, and Do Not Call law violator.  Several posters have identified the caller as a scam HVAC contractor.  Folks, these characters who hide behind invalid phone numbers have no useful services to offer at a fair price.  They specialize in wallettechtomy - the surgical removal of the wallet!  They're not getting mine, and they shouldn't get yours either.

DO NOT BECOME A VICTIM.  DO NOT ANSWER CALLS FROM THIS NUMBER.

Sounded like a boiler room operation. Some guy saying they do work on air conditioning.