N-2	6 Months Ended
	Jun. 30, 2022
Cover [Abstract]
Entity Central Index Key	0001035983
Amendment Flag	false
Securities Act File Number	1-13011
Document Type	10-Q
Entity Registrant Name	COMFORT SYSTEMS USA, INC.
Entity Address, Address Line One	675 Bering Drive
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77057
City Area Code	713
Local Phone Number	830-9600
Entity Emerging Growth Company	false