The home side turned the ball over 23 times in the 97-88 defeat, which was the Suns' first win in three games.
The Rockets coach told reporters: "In the first quarter, Phoenix came up and got real aggressive with us and were denying us around the court. We didn't handle that very well, and then you compound that with shots not going.
"We had no flow tonight. I just thought the 13 assists, 23 turnovers, some really errant passing. We gave up 25 points off our turnovers, so we just fed them."
The Rockets face the Golden State Warriors tomorrow.