Which kit is better for a fully empty system?

The Ultra Synthetic kit. Its 18 oz can holds more refrigerant than the 16.8 oz EZ Chill can, so you are less likely to need a second can.

Do both kits include a gauge and hose?

Yes. Both come with a charging hose and gauge. The Ultra Synthetic hose is described as extra-long and braided, which is easier to route to the low-pressure port.

Is the EZ Chill kit worth the savings?

Only for a small top-off. It has fewer ratings and a lower score, and its 60°F minimum working temperature makes it a poor choice in cool weather.

Can I use either kit on an R-1234yf system?

No. Both are R-134a only. Most 1994 and newer vehicles use R-134a, but check the underhood label before buying.

Will the leak sealer in the Ultra Synthetic kit cause problems?

It can if you later need a professional repair, since sealers complicate recovery and warranty work. Skip it if your system has a known leak.

Why can't I buy the Ultra Synthetic kit in some states?

The listing states it is not available in Washington or Vermont and is ineligible for sale or shipping to WA, VT or CA. The EZ Chill kit has no such restriction listed.

A/C Pro Ultra Synthetic R-134a Car AC Refrigerant Kit ACP001, 18 oz vs EZ Chill Auto A/C Recharge Kit, Includes Charging Hose with Gauge -16.8 OZ

Both kits are made by A/C Pro and use R-134a with a reusable gauge and hose, so the choice comes down to size, additives and track record. The Ultra Synthetic kit (ACP001) carries 18 oz of refrigerant plus anti-wear additives and a 4.4 rating from 1,482 buyers; the EZ Chill kit carries 16.8 oz with cooling boosters and acid/moisture eliminators but only a 3.8 rating from 29 buyers. For most shoppers the Ultra Synthetic kit is the safer pick unless the smaller can is meaningfully cheaper.

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