Thomas Hoffmann Air Conditioning & Heating 
AC running but not cooling your home? Learn the most common causes, troubleshooting tips, and when to call for AC repair in St. Louis. When your air conditioner is running, but your home still feels warm, it can be frustrating—especially during the hot, humid St. Louis summer. You may hear the system operating and feel air coming …
Trane heat pumps provide both heating and cooling from a single outdoor unit, making them an efficient choice for St. Louis homeowners. But when a heat pump stops working properly — especially in heating mode — diagnosing the problem requires understanding how heat pumps work differently from conventional furnaces and air conditioners. This guide covers …
Short cycling — when your Trane furnace turns on, runs for a few minutes, shuts off, and then starts the cycle again — is one of the most common and damaging furnace problems. The furnace never completes a full heating cycle, your home stays cold, and the repeated starts put excessive wear on the heat …
When you call for heat and nothing happens — the furnace starts but never lights, or the burners ignite briefly and then shut off — you have an ignition failure. On Trane furnaces, this typically triggers a 2-flash fault code after the control board has attempted and failed ignition three times. This guide walks through …
A 3-flash fault code on a Trane furnace indicates a pressure switch fault — specifically, the pressure switch failed to close (or opened unexpectedly) during a heating cycle. This is one of the most common Trane furnace fault codes, and it has several possible causes ranging from a blocked vent (a 5-minute fix) to a …
When your Trane air conditioner is running but your home isn't cooling down, it is one of the most frustrating situations a St. Louis homeowner can face — especially in the middle of a July heat wave. The system is on, the outdoor unit is running, but the house stays warm. This guide covers every …