Our iguanas dont have a viv Tony! they all freeroam our house and personally we find this works best for us and our iguanas. they have mega rays in their basking spots and move around as they need to to keep warm or cool down.
PS Im Fixx's other half I just thought I would reply for him as I read this first
Yep thats vinny my girl almost 2 years ago when she was stll in her subadult stage and had just had her first season, she got on famously with Nerys' (yep you bribed her with a satsuma lol) shes alot larger now Nerys and if she got on your head now it would bloody hurt. Must come and visit again soon I want to see your new additions
we have various basking spots around the front room one for each of them, the basking spots all have a megaray bulb for heat and for UVB with reflector . Does the job a treat and no other heating is required for us as we have quite a warm house anyway. As you proberly know iguanas are very inteligent and will find their own way to their basking sites and move away from the heat as and when they need it.
That is what I was planning on doing, great minds maybe lol. Our house is quite cold though so might not be such a good idea until the summer. By then he should be bigger and wont be able to hide under the sofa.