New EPA rules require all newly manufactured residential air conditioners and heat pumps to transition to low-Global Warming Potential (GWP) refrigerants (primarily R-32 and R-454B). The older, commonly used R-410A refrigerant is being phased down due to its high environmental impact.
The primary 2025 HVAC regulations stem from the EPA’s mandate under the AIM Act, which restricts the use of high-Global Warming Potential (GWP) refrigerants like R-410A in newly manufactured systems. Equipment is transitioning to A2L (mildly flammable) alternatives like R-454B and R-32, which have a GWP under 750.
Yes, your air conditioner can absolutely make allergies worse. While a properly maintained unit is designed to filter out allergens, a neglected system can actually circulate or trigger them.
January 1, 2025: Manufacturers stopped producing new R-410A residential split systems and heat pumps. Equipment manufactured before this date can still be sold and installed. January 1, 2026: The original deadline for installing R-410A split systems manufactured before 2025.
The $5,000 rule is a guideline to help homeowners decide whether to repair or replace their HVAC system. You multiply the age of your unit by the cost of the needed repair. If that number exceeds $5,000, replacing your HVAC system is often more cost-effective.
Which AC brand lasts the longest in 2026? Historically, Lennox, Trane, and American Standard lead the industry in longevity. With proper maintenance, these units can last 15–20 years.
The "two-foot rule" in HVAC is a duct design and installation guideline that requires a minimum of 24 inches of straight, uninterrupted space between branch take-offs (where air taps off the main trunk). It is also applied to spacing branches away from end caps, transitions, and the main plenum.
R-410A is currently being phased down rather than fully banned, with the production of new R-410A equipment already banned. The remaining supply will be gradually reduced by 85% through 2036.
R-22 refrigerant typically costs between $𝟗𝟎 and $𝟐𝟓𝟎 per pound. Because R-22 has been phased out, the supply is dwindling, which causes prices to continuously climb.
Myth 2: You have to get rid of your current gas boiler by 2035. FACT: You do not have to get rid of your existing gas boiler by 2035. The biggest myth that has everyone in a panic is that if they have a gas boiler in their home currently, they must replace it before the 2035 deadline.
Air conditioning sickness—often linked to Sick Building Syndrome—occurs when extended exposure to artificially cooled environments, poor ventilation, or unmaintained AC units triggers adverse physical reactions.
Using an air conditioner can be both beneficial and risky for high blood pressure. While AC provides relief from dangerous summer heatwaves that strain the heart, overly cold temperatures can actually raise blood pressure by constricting blood vessels.
Quercetin is widely considered the most powerful natural antihistamine. It is a plant flavonoid that acts as a mast-cell stabilizer, preventing the immune system from releasing histamine.
The accelerated deployment of heat pumps inevitably increases global electricity demand, though energy efficiency and demand response measures can greatly reduce the impact on power systems. The share of electricity in heating for buildings and industry doubles between 2021 and 2030 to 16% if climate pledges are met.
If you make qualified energy-efficient improvements to your home after Jan. 1, 2023, you may qualify for a tax credit up to $3,200. You can claim the credit for improvements made through December 31, 2025.
In short, the 20-degree rule of air conditioning states that you should always keep your AC unit at no more than 20 degrees lower than the outside temperature. It means that, if the outdoor conditions are at 95 degrees, you should set your thermostat at no less than 75 degrees.
R22 refrigerant is illegal to import and manufacturer in the U.S. But it's not illegal for anyone to buy R22 freon. And it's not illegal to sell it IF you have a license. As long as the stocks last, you will be able to continue purchasing R22 from specialized dealers and form your air conditioning company.
If you're interested in learning how to refill R22 in your air conditioner, it is important to know that this is not something a homeowner can do on their own. Due to complexity, safety concerns, training and licensing required we do not recommend doing this without having a trained professional onsite.
R-22 was a commonly used refrigerant that is being phased out because of its harmful impact on the ozone layer. If your HVAC system uses R-22, don't panic — you can still use and maintain your system as normal. But, when it's time for your system to be replaced, you'll need to upgrade to a more sustainable alternative.
As of January 1, 2020, the United States banned the use of the R22 refrigerant, commonly known as Freon.
The top three air conditioning brands for reliability and premium performance in the US are Carrier, Trane, and Lennox.
Yes, you can still buy R-410A equipment. While the production and import of new R-410A systems were banned at the manufacturer level starting January 1, 2025, retailers and contractors are still legally permitted to sell and install existing overstock manufactured before the cutoff date.
In many cases, a 3-ton AC is the perfect size for a 1,500-square-foot home. However, it can be too big if your home is highly energy-efficient, as an oversized unit will "short cycle" (turn on and off too fast) and leave the air uncomfortably humid.
Which HVAC Brands Last the Longest?
One of the most surprising places they can hide? Your ductwork. That's right: your heating and ventilation system may be more than just a pathway for warm or cool air; it could also be a cozy travel route (and nesting spot) for mice.