There was no chance of Colby Bishop wilting in the intense heat at Cheltenham.
But the striker admitted that the conditions faced by Pompey in Gloucestershire were not easy to deal with.
He netted both goals in a 2-0 win, with the first coming after Michael Morrison had nodded Michael Jacobs’ delivery into his path.
The second arrived from the penalty spot after Jacobs had been clumsily brought down in the Robins box.
Bishop now has four goals in as many appearances since arriving from Accrington earlier in the summer and is delighted with his start to life in a Blues shirt.
He said: “It was disgusting out there! It was a sweaty one, but sometimes you have to push yourself to the limits when your body doesn’t want to go there.
“The first goal was a bit of a scramble in the box and I just had to make sure that I got beyond my man.
“I was supposed to be running across the front post, but actually forgot about that – and I’m glad that I did!
"It was a sweaty one, but sometimes you have to push yourself to the limits when your body doesn’t want to go there."
“Before the game I got told that I would be the one taking penalties and thankfully I was able to put it away.
“The fans were singing my name and that’s pretty special for me when I think about where I’ve come from. Hopefully they’ll keep singing it.
“Once you get on a run, you just want to keep it going, so I’m just looking to crack on with so many games coming up.
“I can’t complain and if you’d have offered me four from four at the start of the season, I’d have snatched your hand off.
“A win and a clean sheet is excellent, but now it’s all about the recovery because there’s another big game on Tuesday.”
Young Tottenham loanee Dane Scarlett also started up front, with Joe Pigott brought on after the break.
Cowley said: “We’ve got a great squad here and you only have to look at the players we had coming off the bench.
“There’s competition for places and if the team is going to be up there, that’s what has to happen.”