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Top rated furnace replacement relays
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Best budget pick Sealed Unit Parts Co., Inc.Supco RCO410 Relay/Start Capacitor
Combines relay and start capacitor in one unit, easy to install, and reliable for HVAC systems.
- Affordable
- All-in-one design
- Works with many compressors
- Not for heavy-duty use
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Best overall VNWIQHoneywell R8222D1014 24V DPDT Relay
A versatile DPDT relay with 24V coil, suitable for furnaces and boilers, known for durability.
- Highly reliable
- Easy wiring
- Wide compatibility
- Slightly expensive
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Best for furnace fans White-RodgersWhite-Rodgers 90-293Q Fan Relay
SPDT relay designed specifically for fan control in gas furnaces, with quick-connect terminals.
- Fan-specific design
- Compact size
- Good value
- Not for high current loads
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Best heavy-duty
Furnas 135-12.4111 Definite Purpose Contactor
A 3-pole 30 amp contactor built for commercial and residential HVAC, known for long life.
- Heavy-duty
- Long lifespan
- High current rating
- Bulky size
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Best OEM replacement ClimaTekTrane RLY02807 Fan Relay
Genuine Trane replacement relay for their gas furnaces, ensures exact fit.
- OEM quality
- Perfect fit
- Easy install
- Only for Trane systems
- Pricey
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Best ultra-budget SupcoSupco RCR35 Start Relay
Basic potential relay for start windings, good for simple compressor or motor applications.
- Very cheap
- Simple design
- Widely available
- Limited applications
- Not universal
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Best value MarsMars 78BHT22 Definite Purpose Contactor
A robust 2-pole contactor with 30 amp rating, ideal for residential HVAC replacements.
- Good build quality
- Clear markings
- Interchangeable with many brands
- Coil voltage limited to 24V