Denver AC Loads: Is Your Electrical Panel Ready for Summer?

If you live in a classic Denver neighborhood like Wash Park, the Highlands, or Hilltop, you already know the charm of an older home. Craftsman bungalows, mid-century ranches, brick two-stories with mature trees and deep front porches. What you may not think about until the first scorching week of July is what is hiding in your basement or utility closet: an electrical panel that was installed decades before central air conditioning was a standard feature of Colorado living.

Here is the uncomfortable truth. Adding a modern, high-efficiency AC system to an aging electrical panel does not just stress the system. It can push it past a breaking point that is dangerous, not just inconvenient.

The Summer Load Paradox

Colorado’s Front Range has warmed measurably over the past 30 years, and Denver summers now regularly deliver stretches of 95-plus degree heat. Homeowners are responding by upgrading to larger, more capable air conditioning systems. Newer central AC units and heat pumps are more efficient than ever, but efficiency is a measure of how much cooling you get per watt, not how little electricity the unit draws. A 3-ton central AC system can pull anywhere from 3,500 to 5,000 watts at startup, with sustained draw of 3,000 watts or more during operation.

Now consider the math on an older panel. A 60-amp service, which is still found in many Denver homes built before 1960, provides roughly 14,400 watts of total capacity. That sounds like plenty until you account for your refrigerator, water heater, lighting, EV charger, washer, dryer, and now a central AC unit kicking on during peak afternoon heat. A 100-amp panel offers more headroom at around 24,000 watts, but it too can be overwhelmed in a fully loaded modern home.

The result is a main breaker tripping that leaves you sweating and confused, or worse, a panel that runs hot enough to degrade wiring insulation and create a genuine fire risk over time.

60-Amp, 100-Amp, and 200-Amp Service: What Denver Homes Actually Need

When weighing 100 amp vs 200 amp service in Colorado, the answer for most Denver households is now 200 amps, and in some cases 320 amps if you are also adding EV charging or solar. Here is a quick breakdown:

• 60-amp panels are functionally obsolete for whole-home use. If you have one, an upgrade is not optional, it is overdue.
• 100-amp panels were the standard through the 1970s and may work in smaller homes with modest loads, but they leave little margin for central AC, especially if you are also adding or upgrading other appliances.
• 200-amp panels are the current standard for new construction in Denver and provide the capacity most modern households need to run AC, EV charging, and everyday appliances without tripping breakers or running hot.

A licensed Denver residential electrician can assess your current service entry, metering, and panel to determine exactly what your home requires before your new AC system is ever installed.

Why the Sequence of Work Matters

Many homeowners make the mistake of scheduling HVAC installation first and calling an electrician only after the new system trips the main breaker repeatedly. The smarter approach is to have an electrical assessment done as part of your AC planning, especially if your home is more than 40 years old. An electrical panel upgrade in Denver completed before AC installation ensures the new system is connected correctly, warranties are protected, and your home meets current NEC and local code requirements.

This is especially relevant if you are also considering a new furnace or heat pump installation, since modern variable-speed systems and smart thermostats add their own electrical demands.

Ready to Make Sure Your Home Is Summer-Ready?

Golden West Plumbing, Heating, Air Conditioning, and Electrical provides complete electrical panel assessments and upgrades for Denver homeowners alongside full HVAC installation and service. 

Whether you are planning a new AC installation, replacing an aging furnace, or simply want peace of mind before the heat hits, our licensed electricians and HVAC technicians can evaluate your home as a complete system and recommend the right upgrades in the right order. Contact Golden West today to schedule your pre-season electrical and HVAC assessment, and head into summer with confidence.