No new hiring, after-hours meetings or late-night receptions at the United Nations headquarters. No more optional travel. No new furniture or replacement computers unless absolutely necessary.

Heating and air-conditioning will be curtailed between 6 p.m. and 8 a.m. Expect document delays, fewer translations and no conference freebies, like water. And at the 39-story Secretariat building, some escalators and the decorative water fountain outside are shutting down.

These were among the money-saving measures announced by United Nations budget officials Friday, in response to what they called the most acute cash shortage in years confronting the global organization, which to keep operations running relies on prompt payment of the assessments billed to its 193 members.

“This is not a budget crisis, it’s a cash-flow crisis,” Catherine Pollard, the under secretary general for management strategy, policy and compliance, told a news conference. The United Nations, she said, “depends on member states meeting their obligations on time.”