Form 8-K

8-K — COMFORT SYSTEMS USA INC

Accession: 0001104659-26-076386

Filed: 2026-06-22

Period: 2026-06-19

CIK: 0001035983

SIC: 1731 (ELECTRICAL WORK)

Item: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — tm2618408d1_8k.htm (Primary)

EX-99.1 — EXHIBIT 99.1 (tm2618408d1_ex99-1.htm)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT

REPORT

Pursuant

to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of

earliest event reported) June 19, 2026

Comfort

Systems USA, Inc.

(Exact name of registrant

as specified in its charter)

Delaware

1-13011

76-0526487

(State or other jurisdiction

(Commission

(IRS Employer

of incorporation)

File Number)

Identification No.)

9753 Katy Freeway, Suite

700

Houston,

Texas

77024

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number,

including area code (713) 830-9600

(Former name or former address, if changed

since last report.)

Check the appropriate box below if the Form 8-K

filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written

communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting

material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement

communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement

communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title

of each class

Trading

Symbol(s)

Name

of each exchange on which registered

Common

Stock, $0.01 par value

FIX

New

York Stock Exchange

Indicate by check mark whether the registrant

is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the

Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check

mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting

standards provided pursuant to Section 13(a) of the Exchange Act. ¨

ITEM 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(b) and (c)

On June 22, 2026, Comfort

Systems USA, Inc. (the “Company”) announced that Craig Sasser will transition from his current role as the Company’s

Regional Vice President – Atlantic Region to the role of Company Chief Operating Officer, effective July 1, 2026. In connection

with his appointment as Chief Operating Officer, Mr. Sasser will be entitled to receive an annual base salary equal to $600,000 and

will have a target bonus opportunity equal to 90% of his base salary. In addition, Mr. Sasser will receive a long-term incentive

award, consisting of time-vesting restricted stock units and performance-vesting restricted stock units, with a grant date value equal

to 200% of his base salary and will participate in the Company’s Executive Severance Policy on the terms specified therein.

Mr. Sasser, age 65, has

served as a Regional Vice President for the Company since he joined in September 2018 and has held responsibility for both the North

and Atlantic regions. Prior to joining the Company, Mr. Sasser spent 34 years with a major MEP company where he started his career

in project management and ultimately led the Mid-Atlantic region. Mr. Sasser earned a Bachelor of Science degree in Construction

Management from Purdue University and completed the MCAA Advanced Leadership Institute at Babson College. There are no other changes to

Mr. Sasser’s relationship with the Company.

ITEM 7.01 Regulation FD Disclosure.

On June 22, 2026, the

Company issued a press release announcing Mr. Sasser, Mr. Blair and Mr. McKenna’s transitions within the Company.

A copy of the press release is furnished herewith as Exhibit 99.1 and is incorporated by reference into this Item 7.01.

The information furnished

under Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed”

for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject

to the liabilities of that section, nor shall it be deemed to be incorporated by reference into any filing by the Company under the Securities

Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

ITEM 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit

Number

Description

99.1

Press Release of Comfort Systems USA, Inc., dated June 22, 2026, announcing leadership transitions and appointments.

104

Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements

of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto

duly authorized.

COMFORT SYSTEMS USA, INC.

By:

/s/ Rachel R. Eslicker

Rachel R. Eslicker

Senior Vice President and General Counsel

Date: June 22, 2026

EX-99.1 — EXHIBIT 99.1

EX-99.1

Filename: tm2618408d1_ex99-1.htm · Sequence: 2

Exhibit 99.1

CONTACT:

Julie Shaeff, Chief Accounting Officer

9753 Katy Freeway, Suite 700

ir@comfortsystemsusa.com; 713-830-9687

Houston, Texas 77024

713-830-9600

FOR IMMEDIATE RELEASE

COMFORT SYSTEMS ANNOUNCES LEADERSHIP TRANSITIONS

AND APPOINTMENTS EFFECTIVE AS OF JULY 1, 2026

Houston, TX — June 22,

2026 — Comfort Systems USA, Inc. (NYSE: FIX) (the “Company”), a leading provider of commercial, industrial

and institutional heating, ventilation, air conditioning and electrical contracting services, today announced that Craig Sasser, currently

Regional Vice President -Atlantic Region, will be appointed to serve as Chief Operating Officer, effective July 1, 2026. Trent

T. McKenna will continue to serve as President of the Company.

Mr. Lane commented, “I’m thrilled

to congratulate Craig on his new role. Craig is an ideal fit to be COO, as he is a proven leader whose contributions and deep industry

knowledge have been invaluable to Comfort Systems. He will serve a pivotal role in positioning the Company for long-term growth and success.”

The Company further announced

that Briston Blair will transition from his current role as the Company’s Senior Vice President – Innovation & Strategy

to the role of the Company’s Chief Strategy & Innovation Officer, effective as of July 1, 2026.

Mr. Lane said,

“Briston has been a driving force behind many of our strategy and innovation initiatives, and this promotion reflects the

significant contributions he has made to our Company’s success. I am confident that, as Chief Strategy & Innovation

Officer, he will continue to identify novel opportunities to create value for our stakeholders.”

Mr. Sasser has served as a Regional Vice President

for the Company since he joined in September 2018 and has held responsibility for both the North and Atlantic regions. Prior to joining

the Company, Mr. Sasser spent 34 years with a major MEP company where he started his career in project management and ultimately

led the Mid-Atlantic region. Mr. Sasser earned a Bachelor of Science degree in Construction Management from Purdue University and

completed the MCAA Advanced Leadership Institute at Babson College.

Mr. Blair has served

as the Company’s Senior Vice President – Innovation & Strategy since January 2022. Prior to his current position,

Mr. Blair served as Regional Vice President for the Company and Senior Growth Strategy & Corporate Development Advisor of

the Company. Mr. Blair earned a Bachelor of Arts degree in Communications from The University of North Carolina at Chapel Hill and

his MBA from East Carolina University.

Comfort Systems USA®

is a premier provider of business solutions addressing workplace comfort, with 197 locations in 143 cities around the nation. For more

information, visit the Company’s website at www.comfortsystemsusa.com.

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