Are Top Floor Apartments Hotter? Why It Happens and What Helps

Why top floor apartments get hotter, especially at night, and renter-friendly ways to reduce heat from roof exposure, windows, and poor ventilation.

Written by the Dwell Calm editorial team | Last updated May 13, 2026

Use this guide to separate roof heat, window sun, trapped indoor heat, poor airflow, and humidity before assuming the AC is the only problem.

Quick diagnosis table

Step-by-step checks

Why upper apartments hold heat

Heat from the roof and sun-facing walls builds through the day. By evening, the apartment can stay hot even after outdoor temperature drops.

Notice when the ceiling or upper walls feel warm after sunset. That stored heat can keep releasing into the room even when outdoor air finally cools.

Window strategy matters

South and west windows can turn a room into a heat collector. Close shades early and open windows only when outdoor air is cooler.

Treat sun control as a morning or early-afternoon task. Once the glass, blinds, and furniture are hot, the room has already stored heat.

Use fans to remove heat

A fan near a window blowing out can help exhaust hot air. Another open window or door path lets cooler replacement air enter when conditions are right.

Exhaust hot air only when outdoor air is cooler and safe to bring in. Otherwise, use fans for personal comfort and keep heat sources shaded.

Reduce indoor humidity

Humid air makes a hot bedroom feel worse. Use exhaust fans after showers and avoid adding moisture indoors.

Humidity makes heat feel heavier and slows comfort recovery. Use bathroom and kitchen exhaust, avoid indoor drying, and measure before adding more cooling.

Low-cost fixes to try first

Use the least permanent fix that addresses the confirmed cause. That usually means clearing vents, sealing a specific draft, using curtains or window film, adjusting fan placement, measuring humidity, or documenting a maintenance issue. Avoid buying several products at once because you will not know which one helped.

Renter-friendly fixes

Good renter options include removable weatherstripping, rope caulk, window film, door draft stoppers, plug-in hygrometers, portable fans, rugs, curtain liners, and written maintenance requests. Keep receipts and photos, and avoid screws, permanent caulk, wiring changes, or anything that could affect the deposit unless the landlord approves it.

When to call a professional

Call a qualified professional or property manager if you see mold, water stains, electrical heat, broken windows, no HVAC airflow, unsafe heat, combustion appliance concerns, or a room that stays far outside the rest of the home after basic checks.

Mistakes to avoid

• Do not hide leaks, condensation, or mold with decor.
• Do not block supply or return vents.
• Do not caulk moving window parts shut.
• Do not use permanent fixes in a rental without permission.

FAQ

Are top floor apartments hotter?

Usually yes, especially in sunny buildings with roof heat gain.

Why is my apartment hot at night?

Building materials release stored daytime heat slowly after sunset.

Do curtains help top-floor heat?

Yes, especially when closed before direct sun arrives.

Can a fan cool the air?

No, but it can improve comfort and exhaust hot air if positioned well.

Should I open windows during the day?

Only if outdoor air is cooler or drier than indoor air.

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