New York City is brutal on HVAC systems. Summers hit 95°F with 70% humidity. Winters drop below 10°F with wind chills that stress boilers and heat pumps to their limits. A well-maintained system survives; a neglected one fails at the worst possible time — usually during a heat wave or cold snap when technicians are in highest demand.
Spring (April–May): AC Prep
- Replace air filters (every 1–3 months depending on type)
- Clean condenser coils on window units before installing
- Test the system before first hot day — not during it
- Check refrigerant — a unit that isn't cooling well may have a slow leak
- Clear drain lines with a cup of diluted bleach to prevent summer mold
- Schedule mini-split cleaning if you have a ductless system (annual is ideal)
Summer (June–August): Monitor and Maintain
- Replace filters monthly during peak operation
- Keep condensate drain clear — summer humidity creates blockages
- Don't set thermostat below 68°F — systems ice up and fail
- Check that outdoor condenser units have clear airflow — nothing within 2 feet
Fall (September–October): Heat Prep
- Test heat before first cold night
- Bleed radiators if you have steam or hot water heat (trapped air causes banging and cold radiators)
- Schedule boiler inspection — required annually in NYC for building boilers
- Replace furnace filters
- Check thermostat batteries and calibration
Winter (November–March): Protect Against Freeze
- Never let indoor temps drop below 55°F — pipe freezes happen fast
- Insulate exposed pipes in unheated areas (basement, exterior walls)
- Know where your main water shutoff is in case of freeze-burst
- Keep cabinet doors under sinks open during extreme cold
When to Call a Pro
DIY maintenance goes this far. Call an HVAC professional when you have:
- Unusual noises (grinding, banging, squealing)
- Burning or musty smells
- Ice forming on coils or refrigerant lines
- System cycling on and off rapidly
- Unexplained spikes in energy bills
- Refrigerant leaks (illegal to DIY in NYC — must be EPA 608 certified)
Our HVAC repair team and HVAC installation team serve all NYC boroughs and NJ. Same-day service available.
House Help Services provides emergency and home improvement services across NYC and NJ. Get a free estimate or call (206) 401-7828.