Answering the common buyer’s question: which 24V AC fan relay best fits your HVAC setup? This guide compares five reliable options designed for fan control, blower, humidifier, and heat sequencer applications. It highlights who each relay is best for, plus practical considerations like coil voltage, load capacity, and contact form. Use this to pick a relay that offers solid circuit protection and dependable operation in residential and small commercial systems.
| Product | Best For | Key Benefit |
|---|---|---|
| Dreyoo 1 Pack 24V Fan Relay | Single-relay replacements | UL-certified, robust protection |
| LVACODV 90370 General Purpose Relay | Flexible control with multiple contact forms | SPST-NO/NC and SPDT options |
| SZRKRLA 2 Pack 24V Relay | Budget-friendly HVAC control | Wide compatibility, durable build |
| Supco 90370 General Purpose Fan Relay | Standard fan control | Versatile contact configurations |
| HUAREW APFR-360 24V Fan Relay | Heavier duty setups | Long compatibility with common blower models |
Dreyoo 1 Pack 24V Fan Relay
The Dreyoo 1 Pack 24V Fan Relay is a 90-380 isolation relay designed for 24VAC control with SPST configuration. It provides circuit protection and is UL-certified for robust reliability. This relay is best for replacing a single failing relay in Goodman HVAC blowers, humidifiers, heat sequencers, and similar fan-control applications. It offers durable construction and waterproof performance for environments where moisture may be present.
Who it’s best for: homeowners or technicians performing straightforward fan-control replacements in Goodman or compatible units. Why chosen: the UL certification and 1-pole SPST design deliver predictable, simple switching with strong circuit protection. Caution: verify coil and load ratings in your system to ensure compatibility with the blower’s current draw.
90370 General Purpose Relay – LVACODV
This 24V AC relay from LVACODV is built for versatile control, focusing on fan control within electromechanical systems. It supports multiple contact forms (SPST-NO, SPST-NC, SPDT 1 NO/1 NC), providing flexible switching for simple to more complex setups. With a 12A load current, it handles medium-to-heavy loads while maintaining stable operation in demanding environments.
Who it’s best for: technicians needing flexible contact options for varied control configurations. Why chosen: the multiple contact forms let you tailor switching behavior to your circuit without adding extra components. Caution: ensure your load current stays within the 12A rating to avoid overstress.
2 Pack 24V Fan Relay – SZRKRLA
The SZRKRLA 2 Pack 24V Fan Relay is designed for seamless compatibility across HVAC systems, including blowers, air conditioning, heaters, and pump starters. It focuses on efficient fan-control switching triggered by low-voltage signals (24V). The relays emphasize durable metal construction with resistance to wear and corrosion, extending lifespan in typical HVAC environments.
Who it’s best for: budget-conscious installations requiring reliable two-pack relays for multiple circuits. Why chosen: its broad compatibility and sturdy build make it a practical choice for replacing multiple relays in a single project. Caution: check dimensions and electrical specs to confirm fit with your existing blower wiring.
Supco 90370 General Purpose Fan Relay
The Supco 90370 is a general-purpose fan relay with a 12 A load current and a 24 V coil. It offers SPST-NO, SPST-NC, and SPDT 1 NO/1 NC contact forms for flexible fan-control options. This makes it suitable for straightforward fan control in HVAC and related electromechanical systems, with predictable switching performance.
Who it’s best for: installers seeking a standard, dependable relay with multiple contact form options. Why chosen: its versatile contact configurations interpret well across common control circuits. Caution: confirm the coil voltage and load requirements align with your specific blower or fan motor to avoid undersizing.
Dreyoo 2 Pack 24V Fan Relay
The Dreyoo 2 Pack 24V Fan Relay offers a pair of 90-380 isolation relays for 24VAC control. Like the single-pack, this option emphasizes compatibility with Goodman blowers, HVAC components, humidifiers, and heat sequencers. It is well-suited for replacing two relays in one system or supporting multiple control points in a broader setup.
Who it’s best for: projects needing multiple relays in a budget-friendly package. Why chosen: UL certification and robust build support long-term reliability. Caution: verify that both relays will operate within the system’s total current budget to prevent overload.
HUAREW APFR-360 90-360 24V AC Fan Relay
The HUAREW APFR-360 is a 24V AC fan relay rated for 90-360 range with a 12 FLA and options for 60 LRA at 125 VAC, 8 FLA 48 LRA at 250 VAC, and 25A at 277 VAC resistive. It features a universal bracket for easier mounting and broad compatibility with common blower models, humidifiers, and heat sequencers. This relay is suitable for heavier-duty or more demanding installations where consistent switching across multiple lines is needed.
Who it’s best for: users needing a heavier-duty, widely compatible relay with flexible mounting. Why chosen: higher current ratings and universal bracket support simplify integration into complex HVAC setups. Caution: ensure physical dimensions and terminal layout match your control panel before installation.
Buying Guide
What coil voltage and load current matter?
Most HVAC relays run at 24V AC coil voltage. Verify the coil voltage matches your control circuit. Check the contact form (SPST, SPDT, NO/NC) to ensure it can switch the required load. For blower motors or humidifier circuits, confirm the relay can handle the current rating (A) and resistive/ inductive loads.
Which contact form is right for your setup?
SPST-NO (single-pole, normally open) is common for simple on/off control. SPST-NC is useful for fail-safe configurations. SPDT provides both normally open and normally closed options in one device, enabling more complex control logic. Pick based on desired default state and wiring simplicity.
How important is build quality and certifications?
UL certification and rugged construction improve reliability and safety in HVAC environments. Waterproof or corrosion-resistant designs are beneficial in basements, crawl spaces, or outdoor equipment enclosures. Consider the environment where the relay will operate when selecting a model.
How many relays do you need?
For multi-zone or multi-function systems, a two-pack or five-pack may simplify installation and future replacements. Ensure the total current draw across all relays does not exceed your control transformer or power supply capacity.
What about compatibility with common HVAC brands?
Many relays advertise compatibility with Goodman, Coleman, Packard, Jard, Mars, and similar brands. Always compare terminal counts, mounting type, and physical dimensions to your existing relay or control board.
Practical selection checklist
- 24V coil voltage confirmed
- Load current rating suitable for the connected fan or blower
- Appropriate contact form for your circuit
- Durable construction and environmental rating
- Mounting compatibility and wiring terminal layout
Frequently Asked Questions
What is a fan relay in HVAC?
A fan relay is an electrical switch controlled by a low-voltage signal that turns a fan or blower on or off, protecting the control circuit while handling higher current through the fan motor.
Can I use any 24V AC relay with my HVAC system?
Not necessarily. Check coil voltage, current ratings, contact form, and mounting compatibility. Using an incompatible relay can cause improper operation or damage.
What does SPST vs SPDT mean?
SPST is a single-pole switch with on/off control. SPDT can switch between two outputs (NO and NC), allowing more flexible control scenarios.
How many relays should I buy?
That depends on the number of fans, blowers, humidifiers, or heat sequencers you need to control. If in doubt, a small multi-pack can simplify future replacements.
Are relays weather-resistant?
Some relays include waterproof or ruggedized designs for damp or dusty environments. If your installation is outdoors or in a humid space, choose a model rated for such conditions.
Do relays affect energy efficiency?
Relays themselves consume minimal power, primarily when switching. The energy impact is typically negligible compared with the motor load they control.
