Thermostat & Controls Services, Georgetown TX
Thermostat Installation & Service
Install any thermostat, standard, programmable, or smart, with proper wiring, configuration, and testing.
Replace faulty or outdated thermostats. We identify compatibility requirements before recommending equipment.
Recalibrate thermostats reading inaccurately, a 2-3°F offset causes significant comfort and efficiency problems in Georgetown's heat.
Determine if the thermostat or the system is the cause of HVAC problems, the thermostat is rarely the actual culprit.
Relocate thermostats away from heat sources, drafts, or direct sunlight that cause inaccurate temperature readings.
Install a common wire for smart thermostats that require continuous 24V power, without it, smart thermostats often malfunction.
Full smart thermostat setup including wiring, app configuration, scheduling, and compatibility verification.
Optimize thermostat response settings, anticipator adjustment, and stage sequencing for your specific system.
HVAC Electrical Diagnostics & Repair
Systematic low-voltage and line-voltage electrical diagnosis, find faults without replacing working components.
Repair damaged, corroded, or incorrectly wired HVAC control and power circuits.
Diagnose and repair HVAC power supply issues, breakers, disconnects, and line-voltage components.
Correct overcurrent or undersized circuit conditions causing tripped breakers or component damage.
Recover HVAC systems stuck in lockout, error states, or post-power-surge conditions.
Trace and repair 24V control circuit faults, shorts, opens, and incorrect wiring between thermostat and equipment.
Repair or replace outdoor AC disconnect boxes, fuses, and weatherhead connections.
Replace deteriorated flexible conduit and wiring connections at outdoor AC units.
HVAC Control Components
Diagnose and repair HVAC control system failures including boards, relays, and communication wiring.
Full system calibration, thermostat, controls, and equipment operating parameters aligned and verified.
Calibrate system staging, fan delays, and operating behavior for your specific comfort and efficiency goals.
Calibrate control signals between thermostat and equipment, staging, modulation, and communication signals.
Replace failed 24V control transformers, the power supply for the entire low-voltage control circuit.
Replace failed relay boards that control equipment staging and multi-zone operation.
Install safety disconnect switches for code compliance and service safety on HVAC equipment.
Replace aquastat controls on hydronic and boiler systems that regulate water temperature.
Install and configure zone control panels for multi-zone HVAC systems.
Install outdoor temperature sensors for weather-compensating controls and smart thermostat systems.
Our Systematic Approach to Electrical Diagnosis
HVAC electrical systems operate at two distinct voltage levels that fail in different ways and require different diagnostic approaches. The low voltage side, typically 24 volts, runs the control circuit between the thermostat and the equipment's control board, while the line voltage side, 120 or 240 volts, powers the actual motors and compressor. A fault on one side can produce symptoms that look identical to a fault on the other, which is why guessing based on symptoms alone leads to a lot of unnecessarily replaced parts.
Our diagnostic process starts with a visual inspection for obvious damage, scorched wiring, melted connectors, corrosion at terminals, before touching a meter, since visible evidence often points directly to the failure point and saves diagnostic time. From there we work systematically from the thermostat outward, verifying 24V is present and stable at the thermostat, then tracing that same voltage through each leg of the control circuit, R, W, Y, G, and C, to confirm it reaches the equipment control board correctly. Any leg that doesn't show voltage where expected gets traced wire by wire rather than assumed to be a bad thermostat or a bad board.
On the line voltage side, we check actual running and starting amperage against the equipment's nameplate rated values, since a motor or compressor drawing higher amperage than its rating indicates a developing mechanical problem even before it fails outright, while amperage lower than expected can point to a wiring or capacitor issue limiting the load. We also check voltage at the disconnect under load, not just at rest, since voltage drop that only appears when a compressor is actually running is a common sign of a marginal connection that passes a static test but fails under real conditions.
Intermittent faults are the hardest category, problems that only show up under specific conditions like high heat, high humidity, or after the system has been running for an extended period. For these we often use data logging equipment to capture voltage and amperage readings over time rather than relying on a single point in time measurement, since a fault that only appears after two hours of runtime on a 100 degree Georgetown afternoon won't show up on a five minute service call unless we're specifically set up to catch it. This systematic approach takes longer than swapping parts on a guess, but it's the only reliable way to find the actual fault rather than the most convenient suspect.
Frequently Asked Questions, HVAC Electrical Diagnostics
HVAC Electrical or Thermostat Issue?
We trace faults to the actual source, not replace parts until something works.