Meet the SG Heating & Air Conditioning Team!


Scott Greiff

Owner & Managing Member

Scott Greiff is the owner & Managing Member of SG Heating & Air Conditioning LLC and SG Plumbing LLP. He is a Licensed Master HVAC Contractor, BPI-Certified Energy Auditor in 4 Disciplines, a NATE-Certified HVAC Technician, and has over 40 years of trade experience. Scott founded SG Heating & Air Conditioning in 2004 with the mission “To provide our customers with the highest quality repairs and new product installations possible.”

Tim Hawkes

Director of Technical Services

Tim is our Director of Technical Services. Our “Greenest” employee, he is a BPI Certified Building Analyst, Envelope Specialist, Heating & Air Conditioning Specialist. He is NATE-certified, and is a degreed engineer with a ChE from Columbia University. He’s been with us since January 2010.

Rob Cottrell

Master Plumber & Founding Partner

Rob Cottrell is a Licensed Master Plumber and founding partner in SG Plumbing LLP. He has over 20 years experience in all phases of plumbing, with an emphasis on residential remodeling and service plumbing.


Customer Service Representative

Janice is our Customer Service Representative, the friendly voice you’re most likely to hear answering the phone when you call our office. With many years of customer service experience, she fields customer calls, maintains our schedule, and more.



Kathy is our bookkeeper. She has worked as an accountant for large firms and is a Certified Public Accountant. We’ve been lucky to have her at SG Heating & Air Conditioning since August 2009.  


Lead Installer

Luis is our Lead Installer. He’s quiet and a little shy, but is meticulous and hard-working. His fields of expertise include HVAC, Generators, and Welding. Luis was our second employee, and has been with SG since January 2006.


Electrical Technician

Matt is our Electrical Technician. He has several years of experience in the electrical field, and you’ll most likely see him on our installation crew.


HVAC Installation & Service Technician

Jaime is an HVAC Installation & Service Technician. We like to call him our “super-technician” because he has many years of experience in installing and repairing a wide range of heating and cooling equipment, and is also a highly proficient plumber. 


Marketing & Recruitment Manager

Rod is our Marketing & Recruitment Manager. He applies his training and experience in Professional Writing and Digital Marketing toward managing our online presence, including creating our social media posts, overseeing our recruitment efforts, and helping Cosmo publish posts on our blog, “Cosmo’s Corner”.

Handsome Cosmo

The “New Dog”

Cosmo is the new dog. He had big paws to fill, but he is doing a great job. He barks at strangers, gives lots of love to friends, and writes blog posts for “Cosmo’s Corner” – a reliable employee!


Top Dog

Spirit is in charge of greeting visitors, schmoozing the UPS driver for treats, and improving general morale. He’s been with us since April, 2005. On July 26, 2016, Spirit lost his fight with cancer. He was a lovely, obedient, gentle animal, who loved everyone. We often said, “He’s the nicest person I know!” He will be dearly missed…

Could Be You!

Our New Technician

We’re currently looking for an HVAC Installation Technician, an HVAC Service Technician, and a Plumbing Service Technician! APPLY HERE.

Could Be You!

Service Technicians Wanted

Do you just want a job, or would you like a CAREER? SG Heating & Air Conditioning LLC is looking for experienced, reliable, and professional service & installation technicians to work full-time. Apply for these HVAC and Plumbing jobs here!

The Rest of TEAM GREEN!®

HVAC Contractors | Princeton NJ
Princeton, West Windsor, Millstone, Hamilton, Hopewell & Cranbury NJ
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