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Meet The Team

Meet the friendly faces of Yost amd Campbell!

They’re dedicated to making sure your heating, air conditioning and generator equipment is running at peak efficiency so that you feel comfortable in your home.

Staff Member

Tom Monahan

President/Owner

In the 1960’s, Tom Monahan, Sr. purchased Yost & Campbell from Leo Yost, which gave his son Tom Jr. the opportunity to work for the company throughout high school and college. In 1982, Tom Jr. graduated from Fordham University with a Bachelor Degree in Marketing and joined his father at Yost & Campbell, working and learning in all capacities including service heating & cooling systems, managing the office and developing a marketing plan for the company.

In the early 1992’s, Tom took the reins from his father, becoming President/CEO of Yost & Campbell. During his 40+ years of service at Yost & Campbell, Tom has watched the company grow – expanding the boundaries of Yost & Campbell’s service area as well as adding the service and installation of Generac home standby generators to Yost & Campbell’s offerings. Throughout the years, Tom’s leadership has been a key factor in maintaining Yost & Campbell’s reputation as a leader in Heating, Cooling and Generator services throughout the region.

When not in the office, Tom enjoys spending time with his family, playing golf, skiing, and playing guitar.

Staff Member

Kevin Monahan

Vice President/Owner

Kevin is a graduate of Hamilton College and began working in the family business immediately after graduation. After spending several years in the field, “turning the wrenches”, Kevin moved into a managerial role running the accounting and business side of the Yost & Campbell. In 2005, Kevin was instrumental in
consolidating the business and purchasing a 12,000 sq ft building allowing the company to work out of one main hub in Mt. Vernon. Kevin spearheaded the charge to better automate the business leading to a state-of-the-art online
scheduling system in use today as well as integrating our data base into one mobile system.

A native of Westchester County Kevin currently resides in New Rochelle NY. When he is not in the office, Kevin enjoys time with his family and is an avid hockey fan, he is still playing men’s league, and is a diehard NY Jet fan.

Staff Member

Ceci Monahan

Senior Manager

Ceci graduated from Fordham University with a BS in Finance and Computer Science, and then went on to earn her MBA in Finance from Pace University at night while working for Chemical Bank in the Headquarters Finance Group. After several years she moved on to American Express where she worked on several worldwide financial system development projects including the implementation of a world-wide general ledger system and integrating financial reporting into a consolidated database platform. Ceci then took time off to raise her three daughters and, when she was ready to return to the workforce, came to Yost & Campbell part-time. She has taken on additional responsibilities including Accounts Payable, overseeing our Home Comfort Club memberships and marketing.

When not in the office, Ceci enjoys spending time with her family, playing golf, skiing, and listening to Tom play his guitar.

Staff Member

Claude Carnahan

Director of Operations and Logistics

Claude has worked as in the construction industry for over 35 years in a variety of roles and businesses. A graduate of Harrison High,  Claude went on to college and graduated Marist College, and then received an MBA in information systems from Pace University. Claude has been involved with sports all of his life both boxing and rowing crew in his college years. He has fun with his family, enjoys playing golf, and ballroom dancing when he and his wife get the chance.

Claude was born and raised in West Harrison NY and now resides in Connecticut.

Staff Member

Stephanie Beltre

Director of Operations

Stephanie Beltre joined Yost & Campbell 9 years ago after working in Banking for several years. She started her career here as a part-time CSR, demonstrating her abilities to resolve customer issues in a quick and respectful manner. Over the years, she has taken on more and more responsibilities – moving from
Installation Coordinator to Installation Manager to Operations Manager overseeing both the Installations staff and processes as well as the Service representatives. She has recently been promoted to Direction of Operations.

Staff Member

William Vergeli

Inventory Manager

Will has been with Yost & Campbell since 2018, bringing his organizational and logistical skills to us after 9 years in the Marines and subsequently 7 years directly in the HVAC industry. Will's attention to detail and precision has immensely improved all the logistics and efficiency at Yost & Campbell.
Bronx born and bred Will attended Brooklyn College and is an avid diehard NY sports fan and talented artist.

Staff Member

Gregory Fatiuk

Service Department Field Manager

Greg is a long-term employee of Yost & Campbell and has well over 25 years of experience in the residential & commercial HVAC industry. He is an expert on servicing a broad range of equipment including forced air heating, steam and hot water heating systems, high efficiency systems, and ductless
heating / cooling systems. He is NATE and EPA certified and has factory certifications from Carrier, Bryant and Navien.

Greg is responsible for training and managing the Service Professionals, making sure to be accessible to them to assist with any challenges that may arise.

When not providing excellent service to our customers, Greg enjoys watching football – he is a rabid Steelers fan!

Staff Member

Leandro Diaz

Installation Department Field Manager

Leandro has been with Yost & Campbell for the most part of the past 14 years. He started out as an Installation Mechanic, learning all aspects of installing HVAC systems and Generac generators. Over the years, Leo has moved up to Lead Mechanic, playing a key role in training new Install Helpers and Mechanics as well as becoming an expert trouble-shooter and design specialist. Leo’s expertise is invaluable when faced with unusual circumstances in implementing installations. Leo holds many qualifications including a NYC Journeyman’s License, a Con Edison Operators Qualification License, NATE certification, factory certifications from Carrier, Navien, Mitsubishi, and Generac, just to name a few!

Leandro is a longtime resident of Westchester County and enjoys spending his time off with his family and friends.

Staff Member

John Iacono

Senior Comfort Specialist

John began his career at Yost & Campbell 14 years ago, working as an Installation Helper. He quickly learned the ropes and moved over to the Service Department, where he expanded his knowledge of servicing all types of heating and air conditioning equipment and water heaters. As the company grew,
and another Sales person was needed, John jumped at the opportunity to move into the position of Sales Professional, quickly becoming our top guy! John is an expert in design and providing our customers with creative solutions to their heating and cooling needs.

John is factory certified by Carrier, Navien, Mitsubishi and Trane.


John grew up in the Bronx and now lives in Westchester with his wife and four children.

Sydney Prendergast

Customer Experience Manager

Sydney joined Yost & Campbell in the summer of 2021, and has over 20 Years of management in the business of customer service, he was born to do this. He has experience working in small and large companies in a diverse number of industries. As the Customer Experience Manager, he takes pride in going above and beyond to provide the best customer service possible.  At Yost and Campbell, he has witnessed firsthand what it takes to provide top notch customer service in
the Heating & AC industry, and will bring his vast knowledge of customer service to the entire staff at Yost & Campbell.


From Sydney: “I love outdoor activities such as camping, fishing, and hiking.  I love to laugh and enjoying life as it comes. “

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