A surge suppressor, also known as a surge protector or surge arrester, is a device designed to protect electrical equipment, including furnaces and air conditioning (AC) units, from voltage spikes or surges in the electrical supply. Here’s how surge suppressors work and how they protect furnace and AC equipment:

1. Voltage Regulation: Surge suppressors typically include components such as metal oxide varistors (MOVs) or gas discharge tubes that can absorb excess voltage above a certain threshold. When a surge occurs, these components divert the excess voltage away from the connected equipment, helping to regulate the voltage supplied to the devices.
2. Transient Voltage Protection: Surges in electrical supply can occur due to various reasons, including lightning strikes, power grid fluctuations, or switching operations. These surges can deliver a sudden and potentially damaging increase in voltage to connected equipment. Surge suppressors act as a barrier against these transient voltage spikes, preventing them from reaching and damaging sensitive electronic components within furnaces and AC units.
3. Protecting Sensitive Electronics: Modern furnaces and AC units often contain sensitive electronic components, such as circuit boards, controllers, and sensors, which can be vulnerable to damage from voltage surges. Surge suppressors help safeguard these components by limiting the voltage fluctuations that they are exposed to, thus reducing the risk of electrical damage and premature failure.
4. Extending Equipment Lifespan: By providing protection against voltage surges, surge suppressors help extend the lifespan of furnace and AC equipment. Preventing damage to electronic components can reduce the need for costly repairs or replacements, saving both time and money in the long run.
5. Safety and Peace of Mind: In addition to protecting equipment, surge suppressors enhance safety by reducing the risk of electrical fires or hazards caused by voltage surges. They provide peace of mind to homeowners and building occupants, knowing that their HVAC equipment is shielded against potential electrical disturbances.
6. Easy Installation: Surge suppressors are typically installed between the electrical outlet and the equipment they are intended to protect. They are available in various forms, including plug-in devices, hardwired units, and whole-house surge protection systems, making them easy to install and integrate into existing electrical setups.

In summary, surge suppressors are essential components for protecting furnaces and AC equipment from voltage surges and spikes in the electrical supply. By regulating voltage, diverting excess energy, and safeguarding sensitive electronics, surge suppressors help ensure the reliable operation and longevity of HVAC systems.