Sounds like a good place for some of the "swimming pool solar blanket" material. (glorified bubble-wrap).
The stuff is relatively inexpensive & the bubbles keep foliage from direct contact with the exterior layer, so no leaf burn, as you'd get with a plain single layer of covering.
A small "milkhouse heater" with a thermostat set down low (35° - 45°F) keeps the heating bill as low as possible.
Quite a few of us on the forum here use the stuff for greenhouse covering material, it's got UV protection so lasts for years.
Quote:
Save $10 On All Orders Over $75
Coupon Code: E12YCT2B (expires 14 Oct 2012, but they have regular sales
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10' x 16' Rectangular Solar Covers - PoolSupplies.com
(other sizes available)
New coupon code, good 'till 21 October '12:
Quote:
Double Deal: 10% OFF & FREE Shipping on Orders Over $50
Coupon Code: E12YCT3A
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