How Your HVAC System Works
An interactive guide to every component in your home's heating and cooling system — with real local pricing and Texas-specific context.
3D Interactive HVAC System
Drag to rotate the 3D house. Click any component to learn what it does, common problems, and Frosty's real pricing. Toggle between Cooling and Heating modes to see the airflow change.
Detailed Component Diagram
Click any orange ? button to learn about that component — including what it costs to repair or replace.
Tap any component above — or browse below:
What Every Texas Homeowner Should Know
Attic Heat Penalty
Texas attics reach 140–160°F in summer. Your air handler, evaporator coil, and ductwork bake in this heat every day from May through October.
Energy Impact
At 13.8¢/kWh (local average), an inefficient system costs $250–$400/month in summer. A properly maintained system can cut that by 15–25%.
Hermetic System
Your AC uses a sealed refrigerant loop. If refrigerant is low, there's a leak — period. Anyone who just tops it off is wasting your money.
Flat Rate Pricing
We quote the job, not by the hour. You'll know the exact cost before we start. No surprises, no clock-watching.
Your Ductwork Might Be the Biggest Problem
Leaky, deteriorated ducts waste 20–30% of your cooling and can harbor mold, allergens, and contaminants. See exactly what's happening inside your ducts with our interactive tool.
Ductwork Health ToolFrequently Asked Questions
How does a split HVAC system work?
A split system has two units: an outdoor condenser/compressor that removes heat, and an indoor evaporator/air handler (typically in the attic in Texas homes) that cools the air. Refrigerant circulates between them through sealed copper lines, absorbing heat inside and releasing it outside.
Why is my AC in the attic in Texas?
Most Texas homes have attic-mounted air handlers because they're built on slab foundations (no basements). The attic location means your system endures 140–160°F temperatures in summer, making maintenance critical.
What is the most expensive AC component to replace?
The compressor is the most expensive single component, costing $3,500–$5,000 for replacement. It's the heart of your system — when it fails, your AC blows warm air. Frosty Club Premium members save $500 on any repair.
Why is my refrigerant low?
HVAC systems are hermetic (sealed). If refrigerant is low, there's a leak somewhere in the system. We never just 'gas and go' — we locate the leak, repair it, then recharge to manufacturer specs. Leak repair + recharge costs $350–$1,000.
How often should I change my air filter in Texas?
Every 1–3 months, depending on factors like pets, allergies, and home size. In Texas, where we rank among the top 20 worst states for allergies, monthly changes during peak pollen season (spring and fall) are recommended.
What do leaky ducts cost me?
Leaky ductwork in Texas attics can waste 20–30% of your conditioned air, costing $50–$100/month in wasted energy. Over 10 years, that's $6,000–$12,000 spent cooling your attic instead of your home.
Written by
Omar Jacobo
EPA 608 Certified Technician (#2396328) | Co-Owner, Frosty's HVAC LLC
Omar has been serving local homeowners since 2018. Learn more
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