Johnston Summer 2026: Prep Your Home for the Heat

Summer in Johnston: Preparation Is Everything

Johnston sits right in the heart of Central Iowa's summer heat zone, where July and August regularly bring 90°F+ days with high humidity. The time to prepare is now — not when your AC is struggling to keep up on the hottest day of the year.

Schedule Your AC Tune-Up

This is the most important step. A professional tune-up includes cleaning the coils, checking refrigerant levels, testing electrical connections, lubricating moving parts, and verifying the system is cooling efficiently. It's the difference between a system that cruises through summer and one that breaks down when you need it most.

Upgrade Your Air Filter

Summer means open windows, outdoor activities, and more allergens in the air. Consider stepping up to a MERV 11 or MERV 13 filter for better filtration during the season. Just make sure your system can handle the higher-rated filter — some older systems need the lower airflow resistance of a basic filter.

Inspect and Clean Your Outdoor Unit

Your condenser unit spent all winter exposed to the elements. Trim any vegetation back at least 2 feet from the unit. Gently rinse the fins with a garden hose from the inside out to flush out dirt and debris. Make sure the unit is level — settling ground can cause it to tilt over time.

Check Your Ductwork

Leaky ducts can waste 20–30% of your cooled air. Common problem areas include connections in unconditioned spaces like attics and basements. Look for gaps, disconnections, or crushed sections. Sealing ducts with mastic or metal tape (not cloth duct tape, which degrades quickly) can make a noticeable difference.

Consider a Dehumidifier

Iowa humidity is no joke. If your home feels clammy even with the AC running, a whole-home dehumidifier can transform your comfort. It works alongside your AC to remove excess moisture, making 76°F feel as comfortable as 72°F — and saving energy in the process.

Trade Allies Heating and Cooling helps Johnston families stay cool every summer. Call (515) 669-4481 to schedule your pre-season tune-up before the rush hits.