The 50-year-old advises staff to drink lots of water and provide drinks for the team with plenty of breaks.
Andrew, who owns Skippers in Euxton, Chorley, said he had to cover his manager during the last heatwave as she was struggling too much.
He said the soaring temperatures have a “massive” impact on business.
Andrew said while chippies on the coastline can be “heaving” as people rush to the seaside, often sales at shops inland can dip by about 30%.
Anna Leigh, owner of The Little Chippy in Tyldesley, Wigan, said she “dreads” the heatwaves.
“If I’m destined for hell, I know what to expect,” she said.
“It can be impossible to work. It drains you.”