what is the lowest outdoor operating temperature for heating mode?

Neither of the two answers had to do with the HEATING function. Try again.

Can the condenser be mounted in an attic or does it have to be mounted outdoors?

NO, the attic gets too hot in summertime.

Does the kit include the line set cover?

No. It does not. You will need to buy that separately

Reviews cite a range from 20-30 Amp breaker for the 12K/115V. Max fuse rating is 25. What's best outside (fusable quick disconnect) vs at breaker box?

I used a Eaton 60 amp, 2 pole non fusable , enclosed AC switch disconnect near the outside unit. I also used 6 ft outdoor "AC Whips" for the wiring outside made by Southwire. I ran indoor wire from the breaker to a junction box inside near the exit to the outside and joined the outdoor wire(AC whip) there as well. As using indoor wire outside is not up to code.

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❄️🔥 Elevate your home comfort game with smart, sleek, and sustainable climate control!

EFFORTLESS DIY SETUP - Quick-connect line set means no special tools or professional help needed—install on your terms.
SMART CLIMATE CONTROL - Control heat, cool, dry, and sleep modes remotely via the intuitive Smart HVAC app.
PEACE OF MIND WARRANTY - Industry-leading limited lifetime compressor warranty plus 7-year parts coverage keeps you covered.
UNMATCHED ENERGY EFFICIENCY - Experience up to 22 SEER for maximum savings and eco-friendly comfort.
DURABILITY MEETS COASTAL LIVING - Gold Fin condenser resists corrosion, perfect for homes near the ocean or humid climates.

The 12k BTU 22 SEER MrCool DIY 4th Gen Ductless Heat Pump Split System delivers top-tier energy efficiency and versatile climate modes in a sleek wall-mounted design. Featuring a corrosion-resistant Gold Fin condenser and easy DIY installation with quick-connect lines, it’s engineered for durability and convenience. Control your environment remotely via the Smart HVAC app and enjoy unmatched peace of mind with a limited lifetime compressor warranty.

Brand Name	MRCOOL
Model Info	DIY-12-HP-WM-115C25
Product Dimensions	40.64 x 66.04 x 91.44 cm; 45.36 kg
Efficiency	22 SEER
Capacity	1 Tons
Noise	23.5 dB
Installation Type	Split System
Part Number	DIY-12-HP-WM-115C25
Form Factor	Wall Mounted
Special Features	Dehumidifier
Color	Gold
Voltage	115
Wattage	25.0
Batteries Included?	No
Batteries Required?	No
Item Weight	45.4 Kilograms

12k BTU 22 SEER MrCool DIY Ductless Heat Pump Split System 4th Generation - Wall Mounted

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