Comfort Systems USA drops as data center worries grow

** Shares of heating, ventilation and air-conditioning contractor Comfort Systems USA FIX.N fall 8.3% to $1,173.80 in afternoon trading

** "Concerns around the durability of the data-center buildout are clearly front and center," D.A. Davidson says in a note

** Brokerage says the co's Q3 gross margin of 24.8%, down from 26.1% in the first half of 2026, may be viewed as slightly disappointing

** Still, FIX reported Q3 earnings of $13.91 per share, higher than estimates of $12.87 per share, according to data compiled by LSEG

** Eleven of 12 brokerages rate the stock "buy" or higher and one rates it "hold"; their median PT is $2,148.50

** Including the session's move, stock up about 26% YTD