When your AC won't turn on at all in Spring TX summer, the cause can range from a dead thermostat battery to a failed compressor. Start with the simple checks — they resolve more service calls than homeowners expect.
Need diagnosis right now? Same-day service available. Diagnostic fee waived with qualifying repair.
If the thermostat screen is blank or dim, the batteries are dead. Replace them (usually 2 AA batteries) before doing anything else. This is surprisingly common and takes 2 minutes to rule out.
💰 Cost: Free fix — check batteries first
Find the AC circuit breakers in your electrical panel — there are usually two (one for the outdoor unit, one for the indoor unit). If either is tripped, reset it ONCE. If it trips again immediately, there's an electrical fault and you should not reset it again.
💰 Cost: Reset ONCE only. If it trips again — call.
If the condensate drain line is clogged, a safety float switch shuts the system off to prevent water overflow. Look near the air handler for a secondary float switch (a small box near the drain pan). Clearing the drain line resets the float.
💰 Cost: Clear drain line — see our drain line guide
Confirm the thermostat is: set to COOL (not FAN or HEAT), set to AUTO (not ON), and the setpoint is below the current room temperature. The system won't activate if the setpoint is higher than the room temp.
💰 Cost: Free — check settings
A completely failed capacitor means the compressor can't start at all. The outdoor unit may hum (compressor trying to start) or be completely silent. The indoor fan may still run — moving uncooled air. Same-day capacitor replacement resolves this.
💰 Cost: $150–$350 same-day repair
The contactor is the relay that sends power to the outdoor unit when the thermostat calls for cooling. A failed contactor means power never reaches the compressor and condenser fan. Often presents identically to a capacitor failure — diagnosis distinguishes the two.
💰 Cost: $150–$300 contactor replacement
There's a weatherproof disconnect box on the wall near the outdoor unit. Occasionally these get switched off — by a homeowner during yard work, by a child, or randomly. Check that it's in the ON position before calling.
💰 Cost: Free check — 30 seconds
Start with the free checks: thermostat batteries, thermostat settings, circuit breakers, the outdoor disconnect switch, and the float switch near the air handler. If all these check out and the system still won't start, the most common electrical causes are a failed capacitor or contactor — both same-day repairs in the $150–$350 range.
Step 1: Check thermostat batteries and settings. Step 2: Check the circuit breaker panel. Step 3: Check the outdoor disconnect switch. Step 4: Check for a tripped float switch near the air handler. If all these are fine and the system still won't start, call for same-day service — it's likely a capacitor or contactor.
If the cause is batteries or settings — free. If a circuit breaker, disconnect, or float switch — free to reset. Capacitor replacement: $150–$350. Contactor replacement: $150–$300. More serious electrical faults or compressor failure: $1,500–$3,500. Diagnostic fee waived with qualifying repair at AC Repair Expo.
Yes — if the safety float switch in the drain pan triggers due to a clogged drain line, it shuts the system off completely to prevent water damage. The system won't restart until the drain is cleared and the float switch resets. This is one of the most common 'AC won't turn on' calls in Spring TX summer.
Rated 5.0 · 700+ Google reviews · Read all reviews
"Found the issue fast and fixed it same day. Honest diagnosis, no upselling. Exactly what you want when your AC goes out in July."— Spring TX homeowner, 77386
"Another company quoted thousands more. Expo gave us the honest answer and saved us from a bad decision. They've earned a customer for life."— Harmony, Spring TX
"Professional, fast, and fair. Isaac explained everything before starting. Bill was exactly what was quoted. Highly recommend."— Klein area, 77388
1827 Riley Fuzzel Rd Suite C, Spring, TX 77386
Serving Harmony, Benders Landing, Legends Ranch, Imperial Oaks, Spring Trails, The Woodlands.
19507 Wied Rd Suite B, Spring, TX 77388
Serving Klein, Champion Forest, Vintage Park, Gleannloch Farms, Tomball, Cypress.
AC Repair Expo Heating & Cooling Inc — same-day diagnosis and repair across Spring TX, The Woodlands, Tomball, Klein, and North Houston. Honest diagnosis, fair pricing, licensed TACLB43277C.
Riley Fuzzel Rd: 1827 Riley Fuzzel Rd Suite C, Spring TX 77386 · Wied Rd: 19507 Wied Rd Suite B, Spring TX 77388
