A 20* UQ, full length, will keep you covered from 20-70* nicely
For a TQ, a 20 and a 40 or 50* provides the seasonal warmth without going overboard as a 20*TQ is toasty warm at 60* where as a 50*TQ is more right. Essentially the UQ is more forgiving over the 20-70 temp range than the TQ IMO
If only one TQ is in order, take the lowest temp you will be in and start there ...your warm sleeper self will be buffer enough should the forecast go lower.
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