A capacitor is a critical component in your Carrier air conditioner, responsible for starting the compressor and fan motor while ensuring efficient operation. Over time, capacitors degrade due to heat, voltage fluctuations, or age, leading to weak cooling, humming sounds, or complete system failure. Replacing a faulty capacitor with a high-quality, compatible model can restore your AC’s performance without the cost of professional repairs. In this guide, we’ve tested and reviewed the top 5 capacitors designed specifically for Carrier air conditioners—focusing on durability, compatibility, ease of installation, and real-world reliability.
Quick Product Comparison
Our Top 5 Capacitor For Carrier Air Conditioner Reviews – Expert Tested & Recommended
1. 45+5 MFD Dual Run Capacitor for Carrier Air Conditioner Fan Motor and Condenser
This dual run capacitor is engineered specifically for Carrier air conditioners, delivering reliable startup power to both the compressor and fan motor. With tight ±6% tolerance and compatibility across 370V and 440V systems, it’s a direct replacement that ensures stable performance in extreme temperatures.
Key Features That Stand Out
- ✓ 45+5 MFD dual rating for compressor and fan motor support
- ✓ Works with both 370V and 440V AC systems
- ✓ Compact size: 2.36″ diameter x 3.35″ height – fits most Carrier units
- ✓ Wide operating range: -40°F to 158°F (-40°C to 70°C)
- ✓ Built to USA standards (EIA-456-A and IEC 60252-1:2001)
Why We Recommend It
We picked this as our Best Choice because it combines precision engineering, broad compatibility, and rugged durability. It’s designed to handle the demanding cycles of Carrier HVAC systems without overheating or failing prematurely.
Best For
Homeowners with older or mid-tier Carrier AC units needing a reliable, no-frills replacement that won’t break the bank.
Pros and Cons
Pros:
- Exact fit for many Carrier models
- Stable performance under high load
- Easy installation with clearly marked terminals
- Excellent value for long-term use
Cons:
- No extended warranty included
- Plastic casing may feel less premium than metal-housed alternatives
Customer Reviews
“This A/C capacitor was clearly and accurately described, exact equivalent replacement part, good quality, very easy to install, works perfect! Very reasonable price, very fast shipping.”
“Watched a YouTube video of the most common Central Air not working fixes. I went out and checked mine as it has not worked a couple of years. Sure enough, the main fan was working, but touching the compressor tube, you could feel it pulling every second or so, but not starting. Removing the old p”
2. 45+5 MFD 370V/440V Dual Run Capacitor for Heat Pump and AC Condenser
A heavy-duty dual run capacitor built for both heat pumps and standard AC condensers, this model offers robust construction and consistent output. Its compact yet powerful design makes it ideal for tight spaces inside Carrier outdoor units.
Key Features That Stand Out
- ✓ Dual voltage support: 370V and 440V
- ✓ 45+5 MFD rating matches OEM specs
- ✓ Dimensions: 2-3/8″ diameter x 4″ height – fits most enclosures
- ✓ Operates from -40°F to 158°F
- ✓ Meets stringent USA industry standards
Why We Recommend It
We named this our Editor’s Choice due to its proven track record in real-world installations and strong customer feedback. It’s especially reliable in humid or high-temperature environments where lesser capacitors fail early.
Best For
Users with Carrier heat pumps or dual-mode systems who need a capacitor that handles frequent cycling without degradation.
Pros and Cons
Pros:
- Excellent build quality with sealed design
- Includes 5-year warranty for peace of mind
- Clear terminal labeling prevents wiring errors
- Works seamlessly with Carrier and Bryant units
Cons:
- Slightly taller than some OEM caps—check clearance
- Higher price point than generic brands
Customer Reviews
“Works and fits exactly as it should qt q great price, and with a 5 year warranty.”
“Simple install working as expected I Replaced the original with a cheaper one that only lasted me 5 months so I am hoping that the extra money spent will pay off .”
3. BOJACK 45+5 MFD Dual Run Capacitor for AC Motor and Fan Start
BOJACK delivers exceptional value with this dual run capacitor that doesn’t sacrifice quality for price. Designed for AC motors and fan starts, it’s a favorite among DIYers looking to fix their Carrier unit quickly and affordably.
Key Features That Stand Out
- ✓ 45+5uF ±6% tolerance for accurate performance
- ✓ Dual voltage: 370V/440V compatible
- ✓ Larger size: 2.56″ diameter x 3.74″ height – sturdy build
- ✓ Safety rated for 10,000 AFC (short-circuit protection)
- ✓ Operates in extreme temps: -40°F to 158°F
Why We Recommend It
This earned our Best Budget title because it offers near-OEM performance at a fraction of the cost. Despite the low price, it’s built with thick terminals and a robust casing that resists cracking.
Best For
DIY homeowners on a tight budget who still want reliable performance and don’t want to compromise on safety or compatibility.
Pros and Cons
Pros:
- Very affordable without major quality trade-offs
- Easy to install—even for beginners
- Solid construction with good heat dissipation
- Widely compatible with Carrier, Goodman, and Trane units
Cons:
- No official warranty documentation included
- Bulkier than some replacements—verify space before buying
Customer Reviews
“My central A/C unit suddenly stopped working during a heatwave, and I quickly came across this for a replacement after comparing symptoms to a faulty capacitor. The capacitor is sturdy and seemingly well built. Repairing my unit with this was very simple, and in less than 10 minutes, my A/C unit was”
“Good replacement and is still working great and easy to install and saved me 400 dollars that the ac man would charge me to change it”
4. 45+5 MFD CBB65 Dual Run Capacitor for Heat Pump and Air Conditioner
This QYCKFIXR capacitor combines modern CBB65 construction with a generous 10-year coverage promise, making it a standout for long-term reliability. It’s built to replace both 370V and 440V capacitors and fits seamlessly into Carrier systems.
Key Features That Stand Out
- ✓ 45+5 MFD dual rating for compressor and fan
- ✓ Replaces both 370V and 440V capacitors
- ✓ Backed by a 10-year manufacturer warranty
- ✓ Meets EIA-456-A and IEC 60252-1:2001 standards
- ✓ Compact and lightweight for easy handling
Why We Recommend It
With a decade-long warranty, this capacitor shows the manufacturer’s confidence in its durability. It’s ideal for those who want “set it and forget it” peace of mind.
Best For
Homeowners planning to stay in their homes long-term and want a capacitor that won’t need replacing for years.
Pros and Cons
Pros:
- Exceptional 10-year warranty
- High-quality materials and sealing
- Clear installation instructions included
- Stable performance in fluctuating voltages
Cons:
- Higher upfront cost
- Limited color coding on terminals (may require manual check)
Customer Reviews
“Standard replacement if you know what you’re buying. I slapped it onto my unit and she fired right up. So far so good after a week of operation.”
“Excellent. Worked perfectly. Hopefully i won’t need another one for a while.”
5. BOJACK 35+5 MFD Dual Run Capacitor for AC Motor and Condenser Unit
If your Carrier unit requires a 35+5 MFD capacitor (common in smaller or older models), this BOJACK option delivers reliable performance at an unbeatable price. It’s compact, efficient, and built to last through summer heatwaves.
Key Features That Stand Out
- ✓ 35+5uF dual rating for specific Carrier models
- ✓ Dual voltage: 370V/440V
- ✓ Compact size: 1.97″ diameter x 4.14″ height
- ✓ Wide temperature range: -40°F to 158°F
- ✓ Clearly marked terminals for safe wiring
Why We Recommend It
This is the go-to choice for users with lower-MFD requirements. BOJACK maintains consistent quality even in their smaller capacitors, and customers consistently report successful installations.
Best For
Owners of compact or older Carrier AC units that specify a 35+5 MFD capacitor—especially in milder climates.
Pros and Cons
Pros:
- Perfect for niche MFD requirements
- Affordable and widely available
- Easy to install with minimal tools
- Reliable startup power for fan and compressor
Cons:
- Not suitable for higher-MFD systems
- Shorter lifespan in extreme heat compared to premium models
Customer Reviews
“This BOJACK 35+5uF dual run capacitor was exactly what I needed to get my AC unit running again. It replaced the old capacitor perfectly — same specs, solid build, and the terminals were clearly marked. Installed in just a few minutes and my fan and compressor kicked on immediately.I like that it su”
“I was initially told that replacing the capacitor for my system would cost me over $60, but I decided to give the BOJACK 35+5uF Dual Run Capacitor a try, and I’m so glad I did. Not only did I get it for a much lower price, but it’s been working flawlessly since I installed it.The capacitor arrived w”
Complete Buying Guide for Capacitor For Carrier Air Conditioner
Essential Factors We Consider
When selecting a capacitor for your Carrier air conditioner, always match the MFD rating (microfarads) and voltage exactly. Most Carrier units use dual run capacitors (e.g., 45+5 MFD), which power both the compressor and fan motor. Check your old capacitor’s label or consult your unit’s manual. Also consider operating temperature range, physical size, and whether the cap supports both 370V and 440V—this ensures compatibility across different electrical setups.
Budget Planning
Capacitors range from $15 to $40. While cheaper options like BOJACK offer great value, investing in a model with a warranty (like the 10-year option) can save money long-term. Avoid ultra-cheap generics—they often fail within months. Remember: replacing a capacitor yourself costs under $30, while a technician may charge $150+ for the same job.
Final Thoughts
A failing capacitor is one of the most common—and fixable—issues in Carrier air conditioners. With the right replacement, you can restore cooling quickly and safely. Our top picks balance price, performance, and reliability. Always turn off power at the breaker before installation, and when in doubt, consult a professional.
Frequently Asked Questions
Q: How do I know if my Carrier AC capacitor is bad?
A: Common signs include the AC fan not spinning, the compressor humming but not starting, or the unit shutting off shortly after turning on. You may also notice a swollen or leaking capacitor.
Q: Can I replace a capacitor myself?
A: Yes—if you’re comfortable working with basic tools and follow safety procedures (turn off power, discharge the capacitor). Many homeowners complete the job in under 15 minutes.
Q: What’s the difference between 370V and 440V capacitors?
A: Modern capacitors are often rated for both voltages. As long as your replacement supports both (most do), it will work safely in your system regardless of your home’s voltage.
Q: How often should I replace my AC capacitor?
A: Most last 5–10 years, but extreme heat, power surges, or frequent cycling can shorten lifespan. Inspect annually during maintenance.
Q: Will the wrong MFD rating damage my AC?
A: Yes—using a capacitor with incorrect MFD can cause motors to overheat, reduce efficiency, or fail prematurely. Always match the original specs exactly.
Don’t let a faulty capacitor leave you sweating this summer. Whether you need a budget-friendly fix or a long-term solution with a warranty, one of these top-rated capacitors will get your Carrier air conditioner running like new. Click any “Check Price” button above to find the best deal today!