Same-day AC repair, installation, and heating service for Melissa homeowners. Licensed, insured, and locally trusted.
From emergency AC repair to full system replacements, we keep Melissa homes comfortable year-round.
Fast diagnosis and repair for all makes and models. Most repairs completed same day.
New system installations with energy-efficient units sized right for your Melissa home.
Furnace repair, heat pump service, and full heating system replacements.
Seasonal tune-ups that extend equipment life and keep your system running at peak efficiency.
24/7 emergency HVAC response. We're available when you need us most.
Duct cleaning, air filtration, and smart thermostat upgrades for healthier air.
We know what Melissa homes need — especially during brutal Texas summers.
Melissa is one of Collin County's most sought-after communities, known for its larger lots, top-rated schools, and proximity to the Heard Natural Science Museum. The homes here range from executive estates to newer construction builds — all of which demand reliable, properly sized HVAC systems to handle North Texas heat.
Summer temperatures in Melissa regularly push past 100°F, and an undersized or aging system simply can't keep up. United National HVAC provides fast, professional service so your home stays cool when it counts. We're familiar with the neighborhoods off US-75 corridor, FM 545, and the fast-growing neighborhoods near Melissa High School.
Whether you need a quick repair or a full system upgrade, our team arrives on time, works clean, and gets it done right the first time.
We typically dispatch to Melissa same day. For emergency calls, we prioritize response within 2–4 hours.
Yes — we service all major brands including Carrier, Lennox, Trane, Rheem, Goodman, and more.
Sizing depends on square footage, insulation, and ceiling height. We perform a proper load calculation before recommending any system.
Yes. United National HVAC is fully licensed and insured to operate throughout Texas including Collin County.
Call now or request an estimate online. Same-day service available in Melissa, TX.
Call 214-983-0507