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Replace faulty or outdated thermostats.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.
Sizing and Replacing 24V Control Transformers
The control transformer steps line voltage down to the 24 volts used by the thermostat and the low voltage control circuit, and it's the power source for essentially every low voltage component in the system, the thermostat, relays, gas valve, and on many systems the ignition control as well. Transformers are rated in volt-amps, commonly 40VA on standard residential equipment, and that rating represents the maximum load the transformer can supply before it overheats and fails, which becomes directly relevant any time low voltage accessories get added to a system after original installation.
The most common transformer failure we diagnose is one caused by an overloaded secondary circuit rather than a transformer that simply wore out. Adding a smart thermostat, a zone control system, or additional relays without checking the total VA draw against the transformer's rating pushes it past its design capacity, and an overloaded transformer runs hot, degrades faster than its rated life, and eventually fails, often taking out the internal fuse link most transformers include as a safety feature, or in worse cases developing a winding short that can cascade into control board damage.
A shorted or grounded low voltage wire is the other major cause we see, where insulation damage somewhere in the 24V wiring run, often from rodent damage in an attic or a nicked wire from other trade work, creates a direct short across the transformer's secondary. This draws far more current than the transformer or its fuse is rated for and typically blows the fuse immediately or, if the transformer lacks internal fuse protection, can burn out the transformer itself in a way that damages the winding beyond simple replacement.
Our replacement process starts with calculating actual VA load from every low voltage component in the system, thermostat, relays, zone dampers if present, gas valve, to confirm the replacement transformer is correctly sized rather than just swapping in an identical replacement that may have been undersized from the original installation. We also trace the low voltage wiring for shorts or grounds before energizing a new transformer, since installing a new transformer onto a circuit with an existing short just destroys the replacement the same way it destroyed the original. Georgetown attics running well over 100 degrees for months at a time accelerate transformer wear generally, since heat is a major factor in insulation breakdown inside any transformer winding, so we factor ambient mounting location into the replacement recommendation when a transformer is mounted in an especially hot part of the attic.
Frequently Asked Questions, HVAC Transformer Replacement
HVAC Electrical or Thermostat Issue?
We trace faults to the actual source, not replace parts until something works.