Full Breakdown
Mayor Mamdani Calls for 78°F Thermostat Setting Amid Historic Heat Wave
7/4/2026, 5:54:35 AM
Background: Record Heat and Grid Stress
In early July 2026 a heat dome drove New York City temperatures to 100 °F, the first triple-digit reading since 2012, while LaGuardia Airport hit 94 °F at midnight and 102 °F during the day. The National Weather Service warned of dangerous, record-breaking heat, and the New York Independent System Operator (NYISO) issued an energy-watch for declining operating reserves.
Data & Statistics
NYC reached 100 °F, matching its 1966 record and the first triple-digit high since 2012. Con Edison logged outages for about 80,000 customers and cut voltage in parts of the Bronx, Queens, and Staten Island. The Department of Energy’s June 2023 guidance advised indoor temperatures of 75-78 °F, a recommendation later removed. Past mayors—including Rudy Giuliani (1999) and Eric Adams (2023)—issued the same 78-degree advisory.
City’s Heat-Emergency Measures
Mamdani activated the Heat Emergency Plan, adding eight cooling centers, extending pool hours, deploying 21 COOL vans for in-home wellness checks, and expanding outreach to over 600 volunteers. He also asked businesses to set thermostats to 78 °F, dim lights during peak demand, and power down non-essential equipment.
Official Statements & Responses
Mamdani posted on X urging a 78 °F thermostat setting, turning off unused lights and electronics, and unplugging devices to keep the grid stable. Governor Kathy Hochul similarly asked residents to keep AC units between 75-78 °F and avoid unnecessary appliances. The NYISO later reported normal grid operation after the energy-watch.
Criticism & Opposition
Republican leaders described the advisory as socialist overreach. Senators Rand Paul, Rick Scott and Lindsey Graham each framed it as evidence of communism or a threat from socialist Democrats. Former U.N. Ambassador Nikki Haley, former Los Angeles mayoral candidate Spencer Pratt, and former presidential hopeful Vivek Ramaswamy also condemned the guidance, labeling it socialist and urging reliance on fossil-fuel energy.
Conflicting Reports & Gaps
Mamdani said city buildings would keep the 78-degree rule, but a New York Post temperature check found most City Hall spots between 54 °F and 77 °F on the same day. Additionally, the DOE’s 75-78 °F recommendation was removed from its website, leaving its official status unclear.
Verbatim Quotes
- “Set your AC to 78 degrees, turn off lights/electronics you’re not using, and unplug what you can.” — Zohran Mamdani, Mayor of New York City
- “Ambassador Nikki Haley added, "Welcome to socialism.” — Nikki Haley, former U.N. Ambassador
- “In a first-world country, you could turn on the A/C.” — Ted Cruz, U.S. Senator
- “Due to the increase in energy demand and unexpected load challenges, I am also calling on New Yorkers to do their part to proactively conserve electricity if safe to do so by setting air conditioning units between 75 - 78 degrees and avoiding unnecessary appliance use. These small steps can go a long way,” — Kathy Hochul, Governor of New York
What’s Next
The Weather Channel projects continued temperatures in the upper 90s through the Fourth of July, with heat indices potentially exceeding 110 °F. City officials plan to keep cooling centers open through July 5, maintain outreach efforts, and monitor grid load as NYISO prepares for possible additional energy-watch alerts.
