Finding ice on your AC unit in the middle of a Spring, TX summer is alarming — but it's also one of the most common HVAC service calls we get. Here's what's causing it and exactly what to do.
Your air conditioner works by moving refrigerant through an evaporator coil, which absorbs heat from your home's air. When that process is disrupted — either by inadequate airflow or low refrigerant — the coil temperature drops below 32°F and moisture in the air freezes onto the coil. Once ice forms, it further restricts airflow, causing more freezing, until the coil is completely blocked with ice and your system stops cooling entirely.
A clogged air filter is the single most common cause of a frozen AC in Spring, TX. When your filter is packed with dust, your system can't pull enough air across the evaporator coil, the coil gets too cold, and freezing starts. Check your filter first — if it's grey and dense, replace it immediately. Other airflow restrictions include: closed or blocked supply vents, a dirty evaporator coil, or a failing blower motor that isn't moving enough air.
If your system is low on refrigerant (from a slow leak), the refrigerant pressure drops too low and the evaporator coil temperature falls below freezing even with normal airflow. Low refrigerant isn't something you can fix yourself — it requires an EPA-certified technician to locate the leak, repair it, and recharge the system. Running a system with low refrigerant damages the compressor over time.
First, turn the system to "Fan Only" mode (not Off, not Cool — just Fan). This runs the blower without the compressor, moving warm air across the frozen coil to thaw it. Leave it in Fan Only for 2–4 hours. Do not chip or pick at the ice. Once thawed, replace your filter, turn cooling back on, and check your vents are open. If the unit refreezes within a few hours, you have a refrigerant or mechanical issue that needs a technician.
If the unit refreezes after thawing and replacing the filter, if you hear hissing sounds near the refrigerant lines, or if your system hasn't been serviced in over a year and keeps freezing — call us. Spring HVAC Repair provides same-day service in Spring, TX and surrounding areas. (281) 612-4418.
Spring HVAC Repair — serving Spring, TX and surrounding areas.
Call (281) 612-4418Switching to Fan Only mode and allowing the system to thaw typically takes 2–4 hours in Spring, TX. You can speed this up slightly by placing towels around the unit to absorb dripping water. Do not turn the cooling back on until the coil is fully clear of ice.
It will thaw if you turn it to Fan Only, but if the underlying cause (dirty filter, low refrigerant, failing blower) isn't addressed, it will freeze again — often within hours. A one-time freeze after a very dirty filter is usually self-fixable. Recurring freezing needs a technician.
Yes — as the ice melts, it can overflow the condensate drain pan and cause water damage to ceilings, walls, and flooring below the air handler. If you notice significant ice, set the system to Fan Only and place towels around the unit. Call (281) 612-4418 if you need immediate assistance.