It don’t get much colder than this.

One of Chinatown’s oldest businesses — a beloved ice cream shop churning out nontraditional flavors like green tea and lychee sorbet — is facing eviction from its $1,000-a-month storefront over claims that it uses too much water.

The owners of The Original Chinatown Ice Cream Factory at 65 Bayard St. believe they are really being booted because of their “sweetheart lease” agreement, which they signed over to themselves in 2004, right before selling the property to a local lawyer.

They filed a lawsuit against their landlord this week after getting into a dispute with him about their water use and the building’s cooling tower.

In early December, a summons was issued by the Department of Health for failure to register the tower — prompting the landlord, Nolan Cheng, to threaten eviction.

He gave the Seid family, which owns the ice cream factory, five days to fix the problem before eventually ordering them out.

They filed their lawsuit on Thursday to prevent the eviction, claiming the landlord is “responsible for all water charges” — and that it’s spelled out in the lease.

“My landlord is just really unbearable,” co-owner Christina Seid, 35, told The Post.

“He is doing anything he can to get us out to get a higher rent,” she said of Cheng, noting how they’ve been in and out of court since 2011 over the water problems.

The Seids sued Cheng — who purchased the property for $3.8 million — in 2011 over the water problems. He lashed back in court papers, claiming the family was purposely wasting water.

“The Landlord believes that the Tenant, in retaliation for the [suit], started and continues to maliciously waste water,” wrote Cheng’s lawyer.

Joseph Vitulli, a lawyer for the Seids, told The Post that Cheng’s claims are much ado about nothing.

“The landlord . . . has no legitimacy in any of these actions to enforce an eviction proceeding.”