Subsequent Events	12 Months Ended
Dec. 31, 2015
Subsequent Events.
Subsequent Events	16. Subsequent Events Effective January 1, 2016, we acquired the remaining 40% noncontrolling interest in Environmental Air Systems, LLC ("EAS") headquartered in Greensboro, North Carolina. As required under applicable accounting standards, since the original acquisition in 2011, EAS has been fully consolidated with Comfort Systems USA's financial results. As a result, this transaction will not affect the presentation of revenue, EBITDA or other financial metrics for Comfort Systems USA that are above the elimination of noncontrolling interest numbers in our financial statements. EAS was the only entity in which we reported a noncontrolling interest for financial statement purposes as of December 31, 2015. On February 22, 2016, the Company entered into Amendment No. 4 to Second Amended and Restated Credit Agreement and Amendment to Other Loan Documents (the "Fourth Amendment" and, together with the Facility, the "Amended Facility") with a syndicate of banks. The Amended Facility is secured by a first lien on substantially all of the Company's personal property except for assets related to projects subject to surety bonds and assets held by certain unrestricted subsidiaries and a second lien on the Company's assets related to projects subject to surety bonds. The Amended Facility provides an increased line of credit to the Company from $250 million to $325 million, with a $100 million accordion option. The line of credit includes up to $125 million issuable in the form of letters of credit. The Amended Facility will expire in February 2021. Effective February 1, 2016, we acquired the ShoffnerKalthoff family of companies, including ShoffnerKalthoff Mechanical Electrical Service, Inc., Shoffner Mechanical Services, Inc. and SKMES, Inc. (collectively, "Shoffner") for $17.25 million plus an earn-out that we will pay if certain financial targets are met after the acquisition date. Shoffner is a regional mechanical contractor based in Knoxville, Tennessee. Shoffner engages in a broad range of mechanical contracting projects, HVAC service and electrical contracting in Knoxville and surrounding areas.

16. Subsequent Events

Effective January 1, 2016, we acquired the remaining 40% noncontrolling interest in Environmental Air Systems, LLC ("EAS") headquartered in Greensboro, North Carolina. As required under applicable accounting standards, since the original acquisition in 2011, EAS has been fully consolidated with Comfort Systems USA's financial results. As a result, this transaction will not affect the presentation of revenue, EBITDA or other financial metrics for Comfort Systems USA that are above the elimination of noncontrolling interest numbers in our financial statements. EAS was the only entity in which we reported a noncontrolling interest for financial statement purposes as of December 31, 2015.

On February 22, 2016, the Company entered into Amendment No. 4 to Second Amended and Restated Credit Agreement and Amendment to Other Loan Documents (the "Fourth Amendment" and, together with the Facility, the "Amended Facility") with a syndicate of banks. The Amended Facility is secured by a first lien on substantially all of the Company's personal property except for assets related to projects subject to surety bonds and assets held by certain unrestricted subsidiaries and a second lien on the Company's assets related to projects subject to surety bonds. The Amended Facility provides an increased line of credit to the Company from $250 million to $325 million, with a $100 million accordion option. The line of credit includes up to $125 million issuable in the form of letters of credit. The Amended Facility will expire in February 2021.

Effective February 1, 2016, we acquired the ShoffnerKalthoff family of companies, including ShoffnerKalthoff Mechanical Electrical Service, Inc., Shoffner Mechanical Services, Inc. and SKMES, Inc. (collectively, "Shoffner") for $17.25 million plus an earn-out that we will pay if certain financial targets are met after the acquisition date. Shoffner is a regional mechanical contractor based in Knoxville, Tennessee. Shoffner engages in a broad range of mechanical contracting projects, HVAC service and electrical contracting in Knoxville and surrounding areas.