One of the biggest points of disagreement about air conditioning is not whether to have it, but how to set it. Some Americans like it cold, and some like it hot, and the difference often plays out among gender lines, with men comfortable at cooler temperatures than women.
 
The debate is fiercest in office buildings where a single temperature is set for everyone, but it plays out in American homes, too. Around 20 % of American homes are set to 69 degrees Fahrenheit or lower when people are home in the summer. Another 18% are 77 degrees or warmer. There are partisans for 72 degrees, and 75 degrees, and everywhere else- a balancing act between comfort and cost.
There are difference from areas with high heating demand to ones with higher A/C demands. Air conditioning has become more common over that period, and homes have become bigger, requiring more energy to cool them.

All of that is counterbalanced by the fact that furnaces and air conditioners have become much more efficient over that time- especially air conditioners. The net effect is the US residential AC energy use is going up, but not by as much as heating energy is going down.
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Technology has the potential to continue improving the efficiency of both heating and cooling. Variable-speed air conditioners already on the market as a premium product, have the potential to reduce AC energy usage by 25-30%. On the heating side, one trend is towards heat pumps- essentially an air conditioner running in reverse. Because these run on electricity instead of fossil fuels, they can significantly reduce emissions in areas where a big portion of the power grid comes from clean sources.

According to the most recent results from the 2020 Residential Energy Consumption Survey, (RECS) 88% of US households use Air Conditioning (AC). Two thirds of US households use central AC or a central heat pump a their main AC equipment.
In 2020 the Midwest Census Region an South Census Region ha the highest percentages of households using AC, at 92% and 93% respectively. The lowest percentages of households using AC was 73% in the West Census Region; this census region includes households in several climate area, such as the marine climate region along the Pacific Coast, where residential AC use was 49%.

Although central AC units are the primary equipment type used in most of the United States, 50% of Northeast households primarily use individual AC units. Individual AC units include window and wall units, mini-splits, and portable units.
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RECS data show that newer homes are more likely to use AC in most climate regions. Nationally 83% of homes built before 1950- and 93% of homes built between 2010 and 2020 used AC. The greatest difference in AC use among old and new housing was in the marine climate region, where only 39% of homes built between 1950 used AC, and 66% of homes built between 2010 and 2020

​With the increased concerns about exposure to allergens, Mold, VOCs and air pollutants, the quality of indoor air is becoming more important to homeowners. This is especially true if anyone in your family suffers from allergies, asthma or respiratory issues.
An air scrubber is a device that attaches directly to the ductwork of your HVAC system. It removes air pollution, VOCs, surface contaminants, pet dander, Odors and dust. It provides a cleaner, healthier and more efficient home. This low maintenance device uses proprietary light waves along with a specialized catalytic process to keep your home cleaner.

​Central air conditioning (or central A/C) is a system in which air is cooled at a central location and distributed to and from rooms by one or more fans and ductwork. The work of the air conditioner compressor is what makes the whole process of air conditioning possible.

​Residential leases carry an “implied warranty of habitability.” This means that a landlord has a duty to maintain the rental unit and keep it fit for residential purposes throughout the entire term of the lease and that the landlord must repair damage to vital facilities.

​If you're planning on making any changes or renovations to your space, you'll probably need to get a building permit. Building permits are required for building, structural, electrical, HVAC, and plumbing projects, and help to ensure that your space is safe for your team and your customers.

​15 to 25 years
In general, most HVAC systems will last 15 to 25 years, but depending on the type of system and other contributing factors, that estimate can be highly variable. Even with HVAC maintenance and regular repairs, eventually, even the best boilers, furnaces, heat pumps, and air conditioners today will run their course.