The Griffins, now up 2-1, can wrap up the best-of-five series with a win in Game 4 on Friday.
Erik Haula scored his first professional goal in the waning moments of the first period to give Houston a 1-0 lead, but former Aeros forward Jeff Hoggan tipped home a centering pass for a power-play goal at 5:30 of the second period to tie the score at 1-1.
Almquist’s wrist shot at 16:22 of the third period got past Mike Condon, making his first start of the series in goal for Houston after Darcy Kuemper was recalled by Minnesota earlier in the day. The Griffins capped the scoring on an empty-net goal by Luke Glendening.
Petr Mrazek (2-1) made 25 saves in the win; Condon (0-1) finished with 35 saves for the Aeros.